Home / 20,805.88-28,711.38-12,309.52

Finding the Fourth Proportional to 20,805.88, 28,711.38 and 12,309.52

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Solution

The fourth proportional to 20,805.88, 28,711.38 and 12,309.52 is: 16,986.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.88 : 28,711.38 = 12,309.52 : x
  2. Step 2: Convert to fraction form
    20,805.88/28,711.38 = 12,309.52/x
  3. Step 3: Cross multiply
    20,805.88x = 28,711.38 × 12,309.52
  4. Step 4: Simplify right side
    20,805.88x = 353,423,306.34
  5. Step 5: Solve for x
    x = 353,423,306.34/20,805.88
  6. Step 6: Final answer
    x = 16,986.70

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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.