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Finding the Fourth Proportional to 500.94, 691.28 and 279.90

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Solution

The fourth proportional to 500.94, 691.28 and 279.90 is: 386.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.94 : 691.28 = 279.90 : x
  2. Step 2: Convert to fraction form
    500.94/691.28 = 279.90/x
  3. Step 3: Cross multiply
    500.94x = 691.28 × 279.90
  4. Step 4: Simplify right side
    500.94x = 193,487.87
  5. Step 5: Solve for x
    x = 193,487.87/500.94
  6. Step 6: Final answer
    x = 386.25

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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.