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Finding the Fourth Proportional to 10,873.12, 15,003.86 and 8,640.40

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Solution

The fourth proportional to 10,873.12, 15,003.86 and 8,640.40 is: 11,922.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,873.12 : 15,003.86 = 8,640.40 : x
  2. Step 2: Convert to fraction form
    10,873.12/15,003.86 = 8,640.40/x
  3. Step 3: Cross multiply
    10,873.12x = 15,003.86 × 8,640.40
  4. Step 4: Simplify right side
    10,873.12x = 129,639,351.94
  5. Step 5: Solve for x
    x = 129,639,351.94/10,873.12
  6. Step 6: Final answer
    x = 11,922.92

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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.