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Finding the Fourth Proportional to 15,729.78, 21,707.08 and 8,656.66

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Solution

The fourth proportional to 15,729.78, 21,707.08 and 8,656.66 is: 11,946.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,729.78 : 21,707.08 = 8,656.66 : x
  2. Step 2: Convert to fraction form
    15,729.78/21,707.08 = 8,656.66/x
  3. Step 3: Cross multiply
    15,729.78x = 21,707.08 × 8,656.66
  4. Step 4: Simplify right side
    15,729.78x = 187,910,811.15
  5. Step 5: Solve for x
    x = 187,910,811.15/15,729.78
  6. Step 6: Final answer
    x = 11,946.18

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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.