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Finding the Fourth Proportional to 87,861.60, 131,792.40 and 81,986.40

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Solution

The fourth proportional to 87,861.60, 131,792.40 and 81,986.40 is: 122,979.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,861.60 : 131,792.40 = 81,986.40 : x
  2. Step 2: Convert to fraction form
    87,861.60/131,792.40 = 81,986.40/x
  3. Step 3: Cross multiply
    87,861.60x = 131,792.40 × 81,986.40
  4. Step 4: Simplify right side
    87,861.60x = 10,805,184,423.36
  5. Step 5: Solve for x
    x = 10,805,184,423.36/87,861.60
  6. Step 6: Final answer
    x = 122,979.60

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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.