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Finding the Fourth Proportional to 84,909.80, 127,340.40 and 25,731.20

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Solution

The fourth proportional to 84,909.80, 127,340.40 and 25,731.20 is: 38,589.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,909.80 : 127,340.40 = 25,731.20 : x
  2. Step 2: Convert to fraction form
    84,909.80/127,340.40 = 25,731.20/x
  3. Step 3: Cross multiply
    84,909.80x = 127,340.40 × 25,731.20
  4. Step 4: Simplify right side
    84,909.80x = 3,276,621,300.48
  5. Step 5: Solve for x
    x = 3,276,621,300.48/84,909.80
  6. Step 6: Final answer
    x = 38,589.44

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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.