Home / 21,780.78-32,630.05-12,869.52

Finding the Fourth Proportional to 21,780.78, 32,630.05 and 12,869.52

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Solution

The fourth proportional to 21,780.78, 32,630.05 and 12,869.52 is: 19,279.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,780.78 : 32,630.05 = 12,869.52 : x
  2. Step 2: Convert to fraction form
    21,780.78/32,630.05 = 12,869.52/x
  3. Step 3: Cross multiply
    21,780.78x = 32,630.05 × 12,869.52
  4. Step 4: Simplify right side
    21,780.78x = 419,933,081.08
  5. Step 5: Solve for x
    x = 419,933,081.08/21,780.78
  6. Step 6: Final answer
    x = 19,279.98

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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.