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Finding the Fourth Proportional to 84,008.80, 125,840.40 and 42,479.20

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Solution

The fourth proportional to 84,008.80, 125,840.40 and 42,479.20 is: 63,631.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,008.80 : 125,840.40 = 42,479.20 : x
  2. Step 2: Convert to fraction form
    84,008.80/125,840.40 = 42,479.20/x
  3. Step 3: Cross multiply
    84,008.80x = 125,840.40 × 42,479.20
  4. Step 4: Simplify right side
    84,008.80x = 5,345,599,519.68
  5. Step 5: Solve for x
    x = 5,345,599,519.68/84,008.80
  6. Step 6: Final answer
    x = 63,631.42

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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.