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Finding the Fourth Proportional to 1,200.76, 1,658.09 and 808.93

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Solution

The fourth proportional to 1,200.76, 1,658.09 and 808.93 is: 1,117.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.76 : 1,658.09 = 808.93 : x
  2. Step 2: Convert to fraction form
    1,200.76/1,658.09 = 808.93/x
  3. Step 3: Cross multiply
    1,200.76x = 1,658.09 × 808.93
  4. Step 4: Simplify right side
    1,200.76x = 1,341,278.74
  5. Step 5: Solve for x
    x = 1,341,278.74/1,200.76
  6. Step 6: Final answer
    x = 1,117.02

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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.