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Finding the Fourth Proportional to 691.67, 954.28 and 392.88

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Solution

The fourth proportional to 691.67, 954.28 and 392.88 is: 542.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.67 : 954.28 = 392.88 : x
  2. Step 2: Convert to fraction form
    691.67/954.28 = 392.88/x
  3. Step 3: Cross multiply
    691.67x = 954.28 × 392.88
  4. Step 4: Simplify right side
    691.67x = 374,921.60
  5. Step 5: Solve for x
    x = 374,921.60/691.67
  6. Step 6: Final answer
    x = 542.05

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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.