Home / 20,545.60-30,769.80-12,672.40

Finding the Fourth Proportional to 20,545.60, 30,769.80 and 12,672.40

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Solution

The fourth proportional to 20,545.60, 30,769.80 and 12,672.40 is: 18,978.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,545.60 : 30,769.80 = 12,672.40 : x
  2. Step 2: Convert to fraction form
    20,545.60/30,769.80 = 12,672.40/x
  3. Step 3: Cross multiply
    20,545.60x = 30,769.80 × 12,672.40
  4. Step 4: Simplify right side
    20,545.60x = 389,927,213.52
  5. Step 5: Solve for x
    x = 389,927,213.52/20,545.60
  6. Step 6: Final answer
    x = 18,978.62

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1.5x scale

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.