Home / 15,015.85-20,721.56-8,301.76

Finding the Fourth Proportional to 15,015.85, 20,721.56 and 8,301.76

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Solution

The fourth proportional to 15,015.85, 20,721.56 and 8,301.76 is: 11,456.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.85 : 20,721.56 = 8,301.76 : x
  2. Step 2: Convert to fraction form
    15,015.85/20,721.56 = 8,301.76/x
  3. Step 3: Cross multiply
    15,015.85x = 20,721.56 × 8,301.76
  4. Step 4: Simplify right side
    15,015.85x = 172,025,417.95
  5. Step 5: Solve for x
    x = 172,025,417.95/15,015.85
  6. Step 6: Final answer
    x = 11,456.26

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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.