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Finding the Fourth Proportional to 478.87, 660.86 and 292.42

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Solution

The fourth proportional to 478.87, 660.86 and 292.42 is: 403.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.87 : 660.86 = 292.42 : x
  2. Step 2: Convert to fraction form
    478.87/660.86 = 292.42/x
  3. Step 3: Cross multiply
    478.87x = 660.86 × 292.42
  4. Step 4: Simplify right side
    478.87x = 193,248.68
  5. Step 5: Solve for x
    x = 193,248.68/478.87
  6. Step 6: Final answer
    x = 403.55

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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.