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Finding the Fourth Proportional to 691.20, 954.18 and 494.82

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Solution

The fourth proportional to 691.20, 954.18 and 494.82 is: 683.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.20 : 954.18 = 494.82 : x
  2. Step 2: Convert to fraction form
    691.20/954.18 = 494.82/x
  3. Step 3: Cross multiply
    691.20x = 954.18 × 494.82
  4. Step 4: Simplify right side
    691.20x = 472,147.35
  5. Step 5: Solve for x
    x = 472,147.35/691.20
  6. Step 6: Final answer
    x = 683.08

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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.