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Finding the Fourth Proportional to 123.02, 169.70 and 81.50

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Solution

The fourth proportional to 123.02, 169.70 and 81.50 is: 112.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.02 : 169.70 = 81.50 : x
  2. Step 2: Convert to fraction form
    123.02/169.70 = 81.50/x
  3. Step 3: Cross multiply
    123.02x = 169.70 × 81.50
  4. Step 4: Simplify right side
    123.02x = 13,830.55
  5. Step 5: Solve for x
    x = 13,830.55/123.02
  6. Step 6: Final answer
    x = 112.43

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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.