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Finding the Fourth Proportional to 691.77, 954.66 and 393

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Solution

The fourth proportional to 691.77, 954.66 and 393 is: 542.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.77 : 954.66 = 393 : x
  2. Step 2: Convert to fraction form
    691.77/954.66 = 393/x
  3. Step 3: Cross multiply
    691.77x = 954.66 × 393
  4. Step 4: Simplify right side
    691.77x = 375,181.38
  5. Step 5: Solve for x
    x = 375,181.38/691.77
  6. Step 6: Final answer
    x = 542.35

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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.