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Finding the Fourth Proportional to 91,146.20, 136,719.30 and 85,605.80

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Solution

The fourth proportional to 91,146.20, 136,719.30 and 85,605.80 is: 128,408.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,146.20 : 136,719.30 = 85,605.80 : x
  2. Step 2: Convert to fraction form
    91,146.20/136,719.30 = 85,605.80/x
  3. Step 3: Cross multiply
    91,146.20x = 136,719.30 × 85,605.80
  4. Step 4: Simplify right side
    91,146.20x = 11,703,965,051.94
  5. Step 5: Solve for x
    x = 11,703,965,051.94/91,146.20
  6. Step 6: Final answer
    x = 128,408.70

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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.