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Finding the Fourth Proportional to 87,115.80, 130,673.70 and 81,210.90

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Solution

The fourth proportional to 87,115.80, 130,673.70 and 81,210.90 is: 121,816.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,115.80 : 130,673.70 = 81,210.90 : x
  2. Step 2: Convert to fraction form
    87,115.80/130,673.70 = 81,210.90/x
  3. Step 3: Cross multiply
    87,115.80x = 130,673.70 × 81,210.90
  4. Step 4: Simplify right side
    87,115.80x = 10,612,128,783.33
  5. Step 5: Solve for x
    x = 10,612,128,783.33/87,115.80
  6. Step 6: Final answer
    x = 121,816.35

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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.