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Finding the Fourth Proportional to 15,375.61, 21,215.53 and 8,659.80

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Solution

The fourth proportional to 15,375.61, 21,215.53 and 8,659.80 is: 11,948.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,375.61 : 21,215.53 = 8,659.80 : x
  2. Step 2: Convert to fraction form
    15,375.61/21,215.53 = 8,659.80/x
  3. Step 3: Cross multiply
    15,375.61x = 21,215.53 × 8,659.80
  4. Step 4: Simplify right side
    15,375.61x = 183,722,246.69
  5. Step 5: Solve for x
    x = 183,722,246.69/15,375.61
  6. Step 6: Final answer
    x = 11,948.94

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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.