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Finding the Fourth Proportional to 87,155.20, 130,734.08 and 21,491.20

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Solution

The fourth proportional to 87,155.20, 130,734.08 and 21,491.20 is: 32,237.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,155.20 : 130,734.08 = 21,491.20 : x
  2. Step 2: Convert to fraction form
    87,155.20/130,734.08 = 21,491.20/x
  3. Step 3: Cross multiply
    87,155.20x = 130,734.08 × 21,491.20
  4. Step 4: Simplify right side
    87,155.20x = 2,809,632,260.10
  5. Step 5: Solve for x
    x = 2,809,632,260.10/87,155.20
  6. Step 6: Final answer
    x = 32,237.12

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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.