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Finding the Fourth Proportional to 87,619.20, 131,428.80 and 43,254.40

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Solution

The fourth proportional to 87,619.20, 131,428.80 and 43,254.40 is: 64,881.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,619.20 : 131,428.80 = 43,254.40 : x
  2. Step 2: Convert to fraction form
    87,619.20/131,428.80 = 43,254.40/x
  3. Step 3: Cross multiply
    87,619.20x = 131,428.80 × 43,254.40
  4. Step 4: Simplify right side
    87,619.20x = 5,684,873,886.72
  5. Step 5: Solve for x
    x = 5,684,873,886.72/87,619.20
  6. Step 6: Final answer
    x = 64,881.60

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1.5x scale

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.