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Finding the Fourth Proportional to 562.71, 776.21 and 387.75

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Solution

The fourth proportional to 562.71, 776.21 and 387.75 is: 534.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    562.71 : 776.21 = 387.75 : x
  2. Step 2: Convert to fraction form
    562.71/776.21 = 387.75/x
  3. Step 3: Cross multiply
    562.71x = 776.21 × 387.75
  4. Step 4: Simplify right side
    562.71x = 300,973.49
  5. Step 5: Solve for x
    x = 300,973.49/562.71
  6. Step 6: Final answer
    x = 534.86

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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.