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Finding the Fourth Proportional to 15,189.68, 20,961.60 and 8,565.68

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Solution

The fourth proportional to 15,189.68, 20,961.60 and 8,565.68 is: 11,820.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,189.68 : 20,961.60 = 8,565.68 : x
  2. Step 2: Convert to fraction form
    15,189.68/20,961.60 = 8,565.68/x
  3. Step 3: Cross multiply
    15,189.68x = 20,961.60 × 8,565.68
  4. Step 4: Simplify right side
    15,189.68x = 179,550,357.89
  5. Step 5: Solve for x
    x = 179,550,357.89/15,189.68
  6. Step 6: Final answer
    x = 11,820.55

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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.