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Finding the Fourth Proportional to 123.95, 185.98 and 42.85

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Solution

The fourth proportional to 123.95, 185.98 and 42.85 is: 64.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.95 : 185.98 = 42.85 : x
  2. Step 2: Convert to fraction form
    123.95/185.98 = 42.85/x
  3. Step 3: Cross multiply
    123.95x = 185.98 × 42.85
  4. Step 4: Simplify right side
    123.95x = 7,969.24
  5. Step 5: Solve for x
    x = 7,969.24/123.95
  6. Step 6: Final answer
    x = 64.29

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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.