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Finding the Fourth Proportional to 91,861.80, 137,792.70 and 77,346.60

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Solution

The fourth proportional to 91,861.80, 137,792.70 and 77,346.60 is: 116,019.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,861.80 : 137,792.70 = 77,346.60 : x
  2. Step 2: Convert to fraction form
    91,861.80/137,792.70 = 77,346.60/x
  3. Step 3: Cross multiply
    91,861.80x = 137,792.70 × 77,346.60
  4. Step 4: Simplify right side
    91,861.80x = 10,657,796,849.82
  5. Step 5: Solve for x
    x = 10,657,796,849.82/91,861.80
  6. Step 6: Final answer
    x = 116,019.90

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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.