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Finding the Fourth Proportional to 1,206.75, 1,665.46 and 682.75

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Solution

The fourth proportional to 1,206.75, 1,665.46 and 682.75 is: 942.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,206.75 : 1,665.46 = 682.75 : x
  2. Step 2: Convert to fraction form
    1,206.75/1,665.46 = 682.75/x
  3. Step 3: Cross multiply
    1,206.75x = 1,665.46 × 682.75
  4. Step 4: Simplify right side
    1,206.75x = 1,137,092.82
  5. Step 5: Solve for x
    x = 1,137,092.82/1,206.75
  6. Step 6: Final answer
    x = 942.28

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Find fourth proportional to 603.38, 832.73 and 341.38
Half scale
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Double scale
Find fourth proportional to 1,207.75, 1,666.84 and 683.75
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.