Home / 20,789.17-31,191.50-12,475.15

Finding the Fourth Proportional to 20,789.17, 31,191.50 and 12,475.15

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Solution

The fourth proportional to 20,789.17, 31,191.50 and 12,475.15 is: 18,717.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,789.17 : 31,191.50 = 12,475.15 : x
  2. Step 2: Convert to fraction form
    20,789.17/31,191.50 = 12,475.15/x
  3. Step 3: Cross multiply
    20,789.17x = 31,191.50 × 12,475.15
  4. Step 4: Simplify right side
    20,789.17x = 389,118,641.23
  5. Step 5: Solve for x
    x = 389,118,641.23/20,789.17
  6. Step 6: Final answer
    x = 18,717.37

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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.