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Finding the Fourth Proportional to 387.72, 577.71 and 381.24

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Solution

The fourth proportional to 387.72, 577.71 and 381.24 is: 568.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.72 : 577.71 = 381.24 : x
  2. Step 2: Convert to fraction form
    387.72/577.71 = 381.24/x
  3. Step 3: Cross multiply
    387.72x = 577.71 × 381.24
  4. Step 4: Simplify right side
    387.72x = 220,246.16
  5. Step 5: Solve for x
    x = 220,246.16/387.72
  6. Step 6: Final answer
    x = 568.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.