Home / 20,931.90-28,877.85-11,974.62

Finding the Fourth Proportional to 20,931.90, 28,877.85 and 11,974.62

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Solution

The fourth proportional to 20,931.90, 28,877.85 and 11,974.62 is: 16,520.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.90 : 28,877.85 = 11,974.62 : x
  2. Step 2: Convert to fraction form
    20,931.90/28,877.85 = 11,974.62/x
  3. Step 3: Cross multiply
    20,931.90x = 28,877.85 × 11,974.62
  4. Step 4: Simplify right side
    20,931.90x = 345,801,280.17
  5. Step 5: Solve for x
    x = 345,801,280.17/20,931.90
  6. Step 6: Final answer
    x = 16,520.30

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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.