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Finding the Fourth Proportional to 83,530.40, 125,587.20 and 81,780.80

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Solution

The fourth proportional to 83,530.40, 125,587.20 and 81,780.80 is: 122,956.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,530.40 : 125,587.20 = 81,780.80 : x
  2. Step 2: Convert to fraction form
    83,530.40/125,587.20 = 81,780.80/x
  3. Step 3: Cross multiply
    83,530.40x = 125,587.20 × 81,780.80
  4. Step 4: Simplify right side
    83,530.40x = 10,270,621,685.76
  5. Step 5: Solve for x
    x = 10,270,621,685.76/83,530.40
  6. Step 6: Final answer
    x = 122,956.69

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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.