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Finding the Fourth Proportional to 387.13, 577.33 and 329.72

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Solution

The fourth proportional to 387.13, 577.33 and 329.72 is: 491.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.13 : 577.33 = 329.72 : x
  2. Step 2: Convert to fraction form
    387.13/577.33 = 329.72/x
  3. Step 3: Cross multiply
    387.13x = 577.33 × 329.72
  4. Step 4: Simplify right side
    387.13x = 190,356.78
  5. Step 5: Solve for x
    x = 190,356.78/387.13
  6. Step 6: Final answer
    x = 491.71

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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.