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Finding the Fourth Proportional to 318.73, 478.02 and 102.25

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Solution

The fourth proportional to 318.73, 478.02 and 102.25 is: 153.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.73 : 478.02 = 102.25 : x
  2. Step 2: Convert to fraction form
    318.73/478.02 = 102.25/x
  3. Step 3: Cross multiply
    318.73x = 478.02 × 102.25
  4. Step 4: Simplify right side
    318.73x = 48,877.55
  5. Step 5: Solve for x
    x = 48,877.55/318.73
  6. Step 6: Final answer
    x = 153.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.