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Finding the Fourth Proportional to 15,881.44, 21,917.28 and 8,808.16

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Solution

The fourth proportional to 15,881.44, 21,917.28 and 8,808.16 is: 12,155.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,881.44 : 21,917.28 = 8,808.16 : x
  2. Step 2: Convert to fraction form
    15,881.44/21,917.28 = 8,808.16/x
  3. Step 3: Cross multiply
    15,881.44x = 21,917.28 × 8,808.16
  4. Step 4: Simplify right side
    15,881.44x = 193,050,909.00
  5. Step 5: Solve for x
    x = 193,050,909.00/15,881.44
  6. Step 6: Final answer
    x = 12,155.76

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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.