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Finding the Fourth Proportional to 424.95, 634.45 and 398.87

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Solution

The fourth proportional to 424.95, 634.45 and 398.87 is: 595.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.95 : 634.45 = 398.87 : x
  2. Step 2: Convert to fraction form
    424.95/634.45 = 398.87/x
  3. Step 3: Cross multiply
    424.95x = 634.45 × 398.87
  4. Step 4: Simplify right side
    424.95x = 253,063.92
  5. Step 5: Solve for x
    x = 253,063.92/424.95
  6. Step 6: Final answer
    x = 595.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.