Home / 20,854.13-28,778.70-11,423.03

Finding the Fourth Proportional to 20,854.13, 28,778.70 and 11,423.03

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Solution

The fourth proportional to 20,854.13, 28,778.70 and 11,423.03 is: 15,763.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,854.13 : 28,778.70 = 11,423.03 : x
  2. Step 2: Convert to fraction form
    20,854.13/28,778.70 = 11,423.03/x
  3. Step 3: Cross multiply
    20,854.13x = 28,778.70 × 11,423.03
  4. Step 4: Simplify right side
    20,854.13x = 328,739,809.57
  5. Step 5: Solve for x
    x = 328,739,809.57/20,854.13
  6. Step 6: Final answer
    x = 15,763.78

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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.