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Finding the Fourth Proportional to 91,999.80, 137,999.70 and 77,237.55

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Solution

The fourth proportional to 91,999.80, 137,999.70 and 77,237.55 is: 115,856.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,999.80 : 137,999.70 = 77,237.55 : x
  2. Step 2: Convert to fraction form
    91,999.80/137,999.70 = 77,237.55/x
  3. Step 3: Cross multiply
    91,999.80x = 137,999.70 × 77,237.55
  4. Step 4: Simplify right side
    91,999.80x = 10,658,758,728.74
  5. Step 5: Solve for x
    x = 10,658,758,728.74/91,999.80
  6. Step 6: Final answer
    x = 115,856.33

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Similar ratio
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1.5x scale

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.