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Finding the Fourth Proportional to 87,206.40, 130,809.60 and 81,374.40

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Solution

The fourth proportional to 87,206.40, 130,809.60 and 81,374.40 is: 122,061.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,206.40 : 130,809.60 = 81,374.40 : x
  2. Step 2: Convert to fraction form
    87,206.40/130,809.60 = 81,374.40/x
  3. Step 3: Cross multiply
    87,206.40x = 130,809.60 × 81,374.40
  4. Step 4: Simplify right side
    87,206.40x = 10,644,552,714.24
  5. Step 5: Solve for x
    x = 10,644,552,714.24/87,206.40
  6. Step 6: Final answer
    x = 122,061.60

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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.