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Finding the Fourth Proportional to 87,219.20, 130,675.20 and 74,931.20

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Solution

The fourth proportional to 87,219.20, 130,675.20 and 74,931.20 is: 112,264.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,219.20 : 130,675.20 = 74,931.20 : x
  2. Step 2: Convert to fraction form
    87,219.20/130,675.20 = 74,931.20/x
  3. Step 3: Cross multiply
    87,219.20x = 130,675.20 × 74,931.20
  4. Step 4: Simplify right side
    87,219.20x = 9,791,649,546.24
  5. Step 5: Solve for x
    x = 9,791,649,546.24/87,219.20
  6. Step 6: Final answer
    x = 112,264.84

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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.