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Finding the Fourth Proportional to 478.18, 659.63 and 281.57

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Solution

The fourth proportional to 478.18, 659.63 and 281.57 is: 388.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.18 : 659.63 = 281.57 : x
  2. Step 2: Convert to fraction form
    478.18/659.63 = 281.57/x
  3. Step 3: Cross multiply
    478.18x = 659.63 × 281.57
  4. Step 4: Simplify right side
    478.18x = 185,730.61
  5. Step 5: Solve for x
    x = 185,730.61/478.18
  6. Step 6: Final answer
    x = 388.42

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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.