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Finding the Fourth Proportional to 418, 576.12 and 392.92

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Solution

The fourth proportional to 418, 576.12 and 392.92 is: 541.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    418 : 576.12 = 392.92 : x
  2. Step 2: Convert to fraction form
    418/576.12 = 392.92/x
  3. Step 3: Cross multiply
    418x = 576.12 × 392.92
  4. Step 4: Simplify right side
    418x = 226,369.07
  5. Step 5: Solve for x
    x = 226,369.07/418
  6. Step 6: Final answer
    x = 541.55

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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.