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Finding the Fourth Proportional to 1,008.53, 1,391.76 and 560.40

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Solution

The fourth proportional to 1,008.53, 1,391.76 and 560.40 is: 773.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.53 : 1,391.76 = 560.40 : x
  2. Step 2: Convert to fraction form
    1,008.53/1,391.76 = 560.40/x
  3. Step 3: Cross multiply
    1,008.53x = 1,391.76 × 560.40
  4. Step 4: Simplify right side
    1,008.53x = 779,945.42
  5. Step 5: Solve for x
    x = 779,945.42/1,008.53
  6. Step 6: Final answer
    x = 773.35

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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.