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Finding the Fourth Proportional to 71,062.68, 106,575.45 and 21,129.33

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Solution

The fourth proportional to 71,062.68, 106,575.45 and 21,129.33 is: 31,688.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,062.68 : 106,575.45 = 21,129.33 : x
  2. Step 2: Convert to fraction form
    71,062.68/106,575.45 = 21,129.33/x
  3. Step 3: Cross multiply
    71,062.68x = 106,575.45 × 21,129.33
  4. Step 4: Simplify right side
    71,062.68x = 2,251,867,852.95
  5. Step 5: Solve for x
    x = 2,251,867,852.95/71,062.68
  6. Step 6: Final answer
    x = 31,688.47

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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.