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Finding the Fourth Proportional to 83,486, 125,236.29 and 21,156.50

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Solution

The fourth proportional to 83,486, 125,236.29 and 21,156.50 is: 31,736.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,486 : 125,236.29 = 21,156.50 : x
  2. Step 2: Convert to fraction form
    83,486/125,236.29 = 21,156.50/x
  3. Step 3: Cross multiply
    83,486x = 125,236.29 × 21,156.50
  4. Step 4: Simplify right side
    83,486x = 2,649,561,569.39
  5. Step 5: Solve for x
    x = 2,649,561,569.39/83,486
  6. Step 6: Final answer
    x = 31,736.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.