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Finding the Fourth Proportional to 91,000.20, 136,500.30 and 86,917.80

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Solution

The fourth proportional to 91,000.20, 136,500.30 and 86,917.80 is: 130,376.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,000.20 : 136,500.30 = 86,917.80 : x
  2. Step 2: Convert to fraction form
    91,000.20/136,500.30 = 86,917.80/x
  3. Step 3: Cross multiply
    91,000.20x = 136,500.30 × 86,917.80
  4. Step 4: Simplify right side
    91,000.20x = 11,864,305,775.34
  5. Step 5: Solve for x
    x = 11,864,305,775.34/91,000.20
  6. Step 6: Final answer
    x = 130,376.70

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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.