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Finding the Fourth Proportional to 71,129.12, 106,699.12 and 21,205.40

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Solution

The fourth proportional to 71,129.12, 106,699.12 and 21,205.40 is: 31,809.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,129.12 : 106,699.12 = 21,205.40 : x
  2. Step 2: Convert to fraction form
    71,129.12/106,699.12 = 21,205.40/x
  3. Step 3: Cross multiply
    71,129.12x = 106,699.12 × 21,205.40
  4. Step 4: Simplify right side
    71,129.12x = 2,262,597,519.25
  5. Step 5: Solve for x
    x = 2,262,597,519.25/71,129.12
  6. Step 6: Final answer
    x = 31,809.72

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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.