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Finding the Fourth Proportional to 500.68, 691.38 and 314.49

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Solution

The fourth proportional to 500.68, 691.38 and 314.49 is: 434.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.68 : 691.38 = 314.49 : x
  2. Step 2: Convert to fraction form
    500.68/691.38 = 314.49/x
  3. Step 3: Cross multiply
    500.68x = 691.38 × 314.49
  4. Step 4: Simplify right side
    500.68x = 217,434.69
  5. Step 5: Solve for x
    x = 217,434.69/500.68
  6. Step 6: Final answer
    x = 434.28

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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.