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Finding the Fourth Proportional to 562.71, 776.79 and 388.92

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Solution

The fourth proportional to 562.71, 776.79 and 388.92 is: 536.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    562.71 : 776.79 = 388.92 : x
  2. Step 2: Convert to fraction form
    562.71/776.79 = 388.92/x
  3. Step 3: Cross multiply
    562.71x = 776.79 × 388.92
  4. Step 4: Simplify right side
    562.71x = 302,109.17
  5. Step 5: Solve for x
    x = 302,109.17/562.71
  6. Step 6: Final answer
    x = 536.88

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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.