Home / 20,921.22-28,877.70-12,424.74

Finding the Fourth Proportional to 20,921.22, 28,877.70 and 12,424.74

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Solution

The fourth proportional to 20,921.22, 28,877.70 and 12,424.74 is: 17,149.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.22 : 28,877.70 = 12,424.74 : x
  2. Step 2: Convert to fraction form
    20,921.22/28,877.70 = 12,424.74/x
  3. Step 3: Cross multiply
    20,921.22x = 28,877.70 × 12,424.74
  4. Step 4: Simplify right side
    20,921.22x = 358,797,914.30
  5. Step 5: Solve for x
    x = 358,797,914.30/20,921.22
  6. Step 6: Final answer
    x = 17,149.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.