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Finding the Fourth Proportional to 91,459.65, 137,874.98 and 85,363.39

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Solution

The fourth proportional to 91,459.65, 137,874.98 and 85,363.39 is: 128,684.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,459.65 : 137,874.98 = 85,363.39 : x
  2. Step 2: Convert to fraction form
    91,459.65/137,874.98 = 85,363.39/x
  3. Step 3: Cross multiply
    91,459.65x = 137,874.98 × 85,363.39
  4. Step 4: Simplify right side
    91,459.65x = 11,769,474,999.61
  5. Step 5: Solve for x
    x = 11,769,474,999.61/91,459.65
  6. Step 6: Final answer
    x = 128,684.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.