Home / 87,639.80-131,459.70-77,502.20

Finding the Fourth Proportional to 87,639.80, 131,459.70 and 77,502.20

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Solution

The fourth proportional to 87,639.80, 131,459.70 and 77,502.20 is: 116,253.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,639.80 : 131,459.70 = 77,502.20 : x
  2. Step 2: Convert to fraction form
    87,639.80/131,459.70 = 77,502.20/x
  3. Step 3: Cross multiply
    87,639.80x = 131,459.70 × 77,502.20
  4. Step 4: Simplify right side
    87,639.80x = 10,188,415,961.34
  5. Step 5: Solve for x
    x = 10,188,415,961.34/87,639.80
  6. Step 6: Final answer
    x = 116,253.30

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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.