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Finding the Fourth Proportional to 15,189.78, 20,956.29 and 8,899.86

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Solution

The fourth proportional to 15,189.78, 20,956.29 and 8,899.86 is: 12,278.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,189.78 : 20,956.29 = 8,899.86 : x
  2. Step 2: Convert to fraction form
    15,189.78/20,956.29 = 8,899.86/x
  3. Step 3: Cross multiply
    15,189.78x = 20,956.29 × 8,899.86
  4. Step 4: Simplify right side
    15,189.78x = 186,508,047.12
  5. Step 5: Solve for x
    x = 186,508,047.12/15,189.78
  6. Step 6: Final answer
    x = 12,278.52

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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.