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Finding the Fourth Proportional to 91,157.55, 136,572.30 and 78,035.55

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Solution

The fourth proportional to 91,157.55, 136,572.30 and 78,035.55 is: 116,912.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,157.55 : 136,572.30 = 78,035.55 : x
  2. Step 2: Convert to fraction form
    91,157.55/136,572.30 = 78,035.55/x
  3. Step 3: Cross multiply
    91,157.55x = 136,572.30 × 78,035.55
  4. Step 4: Simplify right side
    91,157.55x = 10,657,494,545.27
  5. Step 5: Solve for x
    x = 10,657,494,545.27/91,157.55
  6. Step 6: Final answer
    x = 116,912.91

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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.