Home / 15,728.28-21,705.18-8,654.86

Finding the Fourth Proportional to 15,728.28, 21,705.18 and 8,654.86

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Solution

The fourth proportional to 15,728.28, 21,705.18 and 8,654.86 is: 11,943.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,728.28 : 21,705.18 = 8,654.86 : x
  2. Step 2: Convert to fraction form
    15,728.28/21,705.18 = 8,654.86/x
  3. Step 3: Cross multiply
    15,728.28x = 21,705.18 × 8,654.86
  4. Step 4: Simplify right side
    15,728.28x = 187,855,185.65
  5. Step 5: Solve for x
    x = 187,855,185.65/15,728.28
  6. Step 6: Final answer
    x = 11,943.78

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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.