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Finding the Fourth Proportional to 20,572.86, 28,390.50 and 11,141.40

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Solution

The fourth proportional to 20,572.86, 28,390.50 and 11,141.40 is: 15,375.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,572.86 : 28,390.50 = 11,141.40 : x
  2. Step 2: Convert to fraction form
    20,572.86/28,390.50 = 11,141.40/x
  3. Step 3: Cross multiply
    20,572.86x = 28,390.50 × 11,141.40
  4. Step 4: Simplify right side
    20,572.86x = 316,309,916.70
  5. Step 5: Solve for x
    x = 316,309,916.70/20,572.86
  6. Step 6: Final answer
    x = 15,375.11

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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.