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Finding the Fourth Proportional to 70,939.88, 106,427.10 and 21,691.88

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Solution

The fourth proportional to 70,939.88, 106,427.10 and 21,691.88 is: 32,543.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,939.88 : 106,427.10 = 21,691.88 : x
  2. Step 2: Convert to fraction form
    70,939.88/106,427.10 = 21,691.88/x
  3. Step 3: Cross multiply
    70,939.88x = 106,427.10 × 21,691.88
  4. Step 4: Simplify right side
    70,939.88x = 2,308,603,881.95
  5. Step 5: Solve for x
    x = 2,308,603,881.95/70,939.88
  6. Step 6: Final answer
    x = 32,543.10

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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.