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Finding the Fourth Proportional to 1,220.76, 1,684.35 and 723.52

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Solution

The fourth proportional to 1,220.76, 1,684.35 and 723.52 is: 998.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.76 : 1,684.35 = 723.52 : x
  2. Step 2: Convert to fraction form
    1,220.76/1,684.35 = 723.52/x
  3. Step 3: Cross multiply
    1,220.76x = 1,684.35 × 723.52
  4. Step 4: Simplify right side
    1,220.76x = 1,218,656.70
  5. Step 5: Solve for x
    x = 1,218,656.70/1,220.76
  6. Step 6: Final answer
    x = 998.28

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Half scale
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Double scale
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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.