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Finding the Fourth Proportional to 15,633.81, 21,576.72 and 8,917.90

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Solution

The fourth proportional to 15,633.81, 21,576.72 and 8,917.90 is: 12,307.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,633.81 : 21,576.72 = 8,917.90 : x
  2. Step 2: Convert to fraction form
    15,633.81/21,576.72 = 8,917.90/x
  3. Step 3: Cross multiply
    15,633.81x = 21,576.72 × 8,917.90
  4. Step 4: Simplify right side
    15,633.81x = 192,419,031.29
  5. Step 5: Solve for x
    x = 192,419,031.29/15,633.81
  6. Step 6: Final answer
    x = 12,307.88

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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.