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Finding the Fourth Proportional to 460.98, 691.21 and 421.75

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Solution

The fourth proportional to 460.98, 691.21 and 421.75 is: 632.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    460.98 : 691.21 = 421.75 : x
  2. Step 2: Convert to fraction form
    460.98/691.21 = 421.75/x
  3. Step 3: Cross multiply
    460.98x = 691.21 × 421.75
  4. Step 4: Simplify right side
    460.98x = 291,517.82
  5. Step 5: Solve for x
    x = 291,517.82/460.98
  6. Step 6: Final answer
    x = 632.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.