Home / 20,312.40-28,044.15-13,145.85

Finding the Fourth Proportional to 20,312.40, 28,044.15 and 13,145.85

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Solution

The fourth proportional to 20,312.40, 28,044.15 and 13,145.85 is: 18,149.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,312.40 : 28,044.15 = 13,145.85 : x
  2. Step 2: Convert to fraction form
    20,312.40/28,044.15 = 13,145.85/x
  3. Step 3: Cross multiply
    20,312.40x = 28,044.15 × 13,145.85
  4. Step 4: Simplify right side
    20,312.40x = 368,664,189.28
  5. Step 5: Solve for x
    x = 368,664,189.28/20,312.40
  6. Step 6: Final answer
    x = 18,149.71

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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.