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Finding the Fourth Proportional to 1,120.72, 1,681.14 and 686.97

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Solution

The fourth proportional to 1,120.72, 1,681.14 and 686.97 is: 1,030.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.72 : 1,681.14 = 686.97 : x
  2. Step 2: Convert to fraction form
    1,120.72/1,681.14 = 686.97/x
  3. Step 3: Cross multiply
    1,120.72x = 1,681.14 × 686.97
  4. Step 4: Simplify right side
    1,120.72x = 1,154,892.75
  5. Step 5: Solve for x
    x = 1,154,892.75/1,120.72
  6. Step 6: Final answer
    x = 1,030.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.