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Finding the Fourth Proportional to 87,130.40, 130,825.20 and 67,431.20

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Solution

The fourth proportional to 87,130.40, 130,825.20 and 67,431.20 is: 101,247.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,130.40 : 130,825.20 = 67,431.20 : x
  2. Step 2: Convert to fraction form
    87,130.40/130,825.20 = 67,431.20/x
  3. Step 3: Cross multiply
    87,130.40x = 130,825.20 × 67,431.20
  4. Step 4: Simplify right side
    87,130.40x = 8,821,700,226.24
  5. Step 5: Solve for x
    x = 8,821,700,226.24/87,130.40
  6. Step 6: Final answer
    x = 101,247.10

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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.