Home / 20,987.38-28,945.38-15,315.76

Finding the Fourth Proportional to 20,987.38, 28,945.38 and 15,315.76

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Solution

The fourth proportional to 20,987.38, 28,945.38 and 15,315.76 is: 21,123.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,987.38 : 28,945.38 = 15,315.76 : x
  2. Step 2: Convert to fraction form
    20,987.38/28,945.38 = 15,315.76/x
  3. Step 3: Cross multiply
    20,987.38x = 28,945.38 × 15,315.76
  4. Step 4: Simplify right side
    20,987.38x = 443,320,493.19
  5. Step 5: Solve for x
    x = 443,320,493.19/20,987.38
  6. Step 6: Final answer
    x = 21,123.19

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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.