Home / 15,871.28-21,902.65-8,700.72

Finding the Fourth Proportional to 15,871.28, 21,902.65 and 8,700.72

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Solution

The fourth proportional to 15,871.28, 21,902.65 and 8,700.72 is: 12,007.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,871.28 : 21,902.65 = 8,700.72 : x
  2. Step 2: Convert to fraction form
    15,871.28/21,902.65 = 8,700.72/x
  3. Step 3: Cross multiply
    15,871.28x = 21,902.65 × 8,700.72
  4. Step 4: Simplify right side
    15,871.28x = 190,568,769.96
  5. Step 5: Solve for x
    x = 190,568,769.96/15,871.28
  6. Step 6: Final answer
    x = 12,007.15

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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.