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Finding the Fourth Proportional to 15,695.52, 21,659.56 and 8,621.80

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Solution

The fourth proportional to 15,695.52, 21,659.56 and 8,621.80 is: 11,897.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,695.52 : 21,659.56 = 8,621.80 : x
  2. Step 2: Convert to fraction form
    15,695.52/21,659.56 = 8,621.80/x
  3. Step 3: Cross multiply
    15,695.52x = 21,659.56 × 8,621.80
  4. Step 4: Simplify right side
    15,695.52x = 186,744,394.41
  5. Step 5: Solve for x
    x = 186,744,394.41/15,695.52
  6. Step 6: Final answer
    x = 11,897.94

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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.