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Finding the Fourth Proportional to 84,317.20, 126,475.80 and 21,987.70

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Solution

The fourth proportional to 84,317.20, 126,475.80 and 21,987.70 is: 32,981.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,317.20 : 126,475.80 = 21,987.70 : x
  2. Step 2: Convert to fraction form
    84,317.20/126,475.80 = 21,987.70/x
  3. Step 3: Cross multiply
    84,317.20x = 126,475.80 × 21,987.70
  4. Step 4: Simplify right side
    84,317.20x = 2,780,911,947.66
  5. Step 5: Solve for x
    x = 2,780,911,947.66/84,317.20
  6. Step 6: Final answer
    x = 32,981.55

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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.