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Finding the Fourth Proportional to 478.22, 659.90 and 281.70

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Solution

The fourth proportional to 478.22, 659.90 and 281.70 is: 388.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.22 : 659.90 = 281.70 : x
  2. Step 2: Convert to fraction form
    478.22/659.90 = 281.70/x
  3. Step 3: Cross multiply
    478.22x = 659.90 × 281.70
  4. Step 4: Simplify right side
    478.22x = 185,892.42
  5. Step 5: Solve for x
    x = 185,892.42/478.22
  6. Step 6: Final answer
    x = 388.72

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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.