Home / 20,648.72-28,495.24-11,217.28

Finding the Fourth Proportional to 20,648.72, 28,495.24 and 11,217.28

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Solution

The fourth proportional to 20,648.72, 28,495.24 and 11,217.28 is: 15,479.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,648.72 : 28,495.24 = 11,217.28 : x
  2. Step 2: Convert to fraction form
    20,648.72/28,495.24 = 11,217.28/x
  3. Step 3: Cross multiply
    20,648.72x = 28,495.24 × 11,217.28
  4. Step 4: Simplify right side
    20,648.72x = 319,639,085.75
  5. Step 5: Solve for x
    x = 319,639,085.75/20,648.72
  6. Step 6: Final answer
    x = 15,479.85

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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.