Home / 15,512.34-21,407.05-8,438.78

Finding the Fourth Proportional to 15,512.34, 21,407.05 and 8,438.78

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Solution

The fourth proportional to 15,512.34, 21,407.05 and 8,438.78 is: 11,645.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,512.34 : 21,407.05 = 8,438.78 : x
  2. Step 2: Convert to fraction form
    15,512.34/21,407.05 = 8,438.78/x
  3. Step 3: Cross multiply
    15,512.34x = 21,407.05 × 8,438.78
  4. Step 4: Simplify right side
    15,512.34x = 180,649,449.47
  5. Step 5: Solve for x
    x = 180,649,449.47/15,512.34
  6. Step 6: Final answer
    x = 11,645.53

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Half scale
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Double scale
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Similar ratio
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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.