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Finding the Fourth Proportional to 478.18, 660.05 and 281.69

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Solution

The fourth proportional to 478.18, 660.05 and 281.69 is: 388.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.18 : 660.05 = 281.69 : x
  2. Step 2: Convert to fraction form
    478.18/660.05 = 281.69/x
  3. Step 3: Cross multiply
    478.18x = 660.05 × 281.69
  4. Step 4: Simplify right side
    478.18x = 185,929.48
  5. Step 5: Solve for x
    x = 185,929.48/478.18
  6. Step 6: Final answer
    x = 388.83

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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.