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Finding the Fourth Proportional to 10,885.20, 15,021.16 and 5,917.20

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Solution

The fourth proportional to 10,885.20, 15,021.16 and 5,917.20 is: 8,165.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,885.20 : 15,021.16 = 5,917.20 : x
  2. Step 2: Convert to fraction form
    10,885.20/15,021.16 = 5,917.20/x
  3. Step 3: Cross multiply
    10,885.20x = 15,021.16 × 5,917.20
  4. Step 4: Simplify right side
    10,885.20x = 88,883,207.95
  5. Step 5: Solve for x
    x = 88,883,207.95/10,885.20
  6. Step 6: Final answer
    x = 8,165.51

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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.