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Finding the Fourth Proportional to 123.79, 170.87 and 98.93

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Solution

The fourth proportional to 123.79, 170.87 and 98.93 is: 136.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.79 : 170.87 = 98.93 : x
  2. Step 2: Convert to fraction form
    123.79/170.87 = 98.93/x
  3. Step 3: Cross multiply
    123.79x = 170.87 × 98.93
  4. Step 4: Simplify right side
    123.79x = 16,903.67
  5. Step 5: Solve for x
    x = 16,903.67/123.79
  6. Step 6: Final answer
    x = 136.55

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.