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Finding the Fourth Proportional to 123.70, 185.40 and 62.85

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Solution

The fourth proportional to 123.70, 185.40 and 62.85 is: 94.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.70 : 185.40 = 62.85 : x
  2. Step 2: Convert to fraction form
    123.70/185.40 = 62.85/x
  3. Step 3: Cross multiply
    123.70x = 185.40 × 62.85
  4. Step 4: Simplify right side
    123.70x = 11,652.39
  5. Step 5: Solve for x
    x = 11,652.39/123.70
  6. Step 6: Final answer
    x = 94.20

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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.