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Finding the Fourth Proportional to 478.18, 659.91 and 281.71

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Solution

The fourth proportional to 478.18, 659.91 and 281.71 is: 388.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.18 : 659.91 = 281.71 : x
  2. Step 2: Convert to fraction form
    478.18/659.91 = 281.71/x
  3. Step 3: Cross multiply
    478.18x = 659.91 × 281.71
  4. Step 4: Simplify right side
    478.18x = 185,903.25
  5. Step 5: Solve for x
    x = 185,903.25/478.18
  6. Step 6: Final answer
    x = 388.77

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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.