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Finding the Fourth Proportional to 15,713.58, 21,685.05 and 8,640.66

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Solution

The fourth proportional to 15,713.58, 21,685.05 and 8,640.66 is: 11,924.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,713.58 : 21,685.05 = 8,640.66 : x
  2. Step 2: Convert to fraction form
    15,713.58/21,685.05 = 8,640.66/x
  3. Step 3: Cross multiply
    15,713.58x = 21,685.05 × 8,640.66
  4. Step 4: Simplify right side
    15,713.58x = 187,373,144.13
  5. Step 5: Solve for x
    x = 187,373,144.13/15,713.58
  6. Step 6: Final answer
    x = 11,924.28

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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.