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Finding the Fourth Proportional to 691.19, 954.21 and 442.72

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Solution

The fourth proportional to 691.19, 954.21 and 442.72 is: 611.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.19 : 954.21 = 442.72 : x
  2. Step 2: Convert to fraction form
    691.19/954.21 = 442.72/x
  3. Step 3: Cross multiply
    691.19x = 954.21 × 442.72
  4. Step 4: Simplify right side
    691.19x = 422,447.85
  5. Step 5: Solve for x
    x = 422,447.85/691.19
  6. Step 6: Final answer
    x = 611.19

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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.