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Finding the Fourth Proportional to 123.55, 170.48 and 76.90

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Solution

The fourth proportional to 123.55, 170.48 and 76.90 is: 106.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.55 : 170.48 = 76.90 : x
  2. Step 2: Convert to fraction form
    123.55/170.48 = 76.90/x
  3. Step 3: Cross multiply
    123.55x = 170.48 × 76.90
  4. Step 4: Simplify right side
    123.55x = 13,110.50
  5. Step 5: Solve for x
    x = 13,110.50/123.55
  6. Step 6: Final answer
    x = 106.12

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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.