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Finding the Fourth Proportional to 908.13, 1,253.31 and 515.07

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Solution

The fourth proportional to 908.13, 1,253.31 and 515.07 is: 710.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    908.13 : 1,253.31 = 515.07 : x
  2. Step 2: Convert to fraction form
    908.13/1,253.31 = 515.07/x
  3. Step 3: Cross multiply
    908.13x = 1,253.31 × 515.07
  4. Step 4: Simplify right side
    908.13x = 645,542.38
  5. Step 5: Solve for x
    x = 645,542.38/908.13
  6. Step 6: Final answer
    x = 710.85

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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.