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Finding the Fourth Proportional to 442.57, 610.15 and 309.61

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Solution

The fourth proportional to 442.57, 610.15 and 309.61 is: 426.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    442.57 : 610.15 = 309.61 : x
  2. Step 2: Convert to fraction form
    442.57/610.15 = 309.61/x
  3. Step 3: Cross multiply
    442.57x = 610.15 × 309.61
  4. Step 4: Simplify right side
    442.57x = 188,909.11
  5. Step 5: Solve for x
    x = 188,909.11/442.57
  6. Step 6: Final answer
    x = 426.85

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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.