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Finding the Fourth Proportional to 526.80, 726.67 and 387.28

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Solution

The fourth proportional to 526.80, 726.67 and 387.28 is: 534.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.80 : 726.67 = 387.28 : x
  2. Step 2: Convert to fraction form
    526.80/726.67 = 387.28/x
  3. Step 3: Cross multiply
    526.80x = 726.67 × 387.28
  4. Step 4: Simplify right side
    526.80x = 281,426.15
  5. Step 5: Solve for x
    x = 281,426.15/526.80
  6. Step 6: Final answer
    x = 534.21

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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.