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Finding the Fourth Proportional to 87,510.40, 131,131.20 and 65,219.20

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Solution

The fourth proportional to 87,510.40, 131,131.20 and 65,219.20 is: 97,728.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,510.40 : 131,131.20 = 65,219.20 : x
  2. Step 2: Convert to fraction form
    87,510.40/131,131.20 = 65,219.20/x
  3. Step 3: Cross multiply
    87,510.40x = 131,131.20 × 65,219.20
  4. Step 4: Simplify right side
    87,510.40x = 8,552,271,959.04
  5. Step 5: Solve for x
    x = 8,552,271,959.04/87,510.40
  6. Step 6: Final answer
    x = 97,728.64

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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.