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Finding the Fourth Proportional to 79,486.88, 119,217.56 and 20,319.40

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Solution

The fourth proportional to 79,486.88, 119,217.56 and 20,319.40 is: 30,475.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,486.88 : 119,217.56 = 20,319.40 : x
  2. Step 2: Convert to fraction form
    79,486.88/119,217.56 = 20,319.40/x
  3. Step 3: Cross multiply
    79,486.88x = 119,217.56 × 20,319.40
  4. Step 4: Simplify right side
    79,486.88x = 2,422,429,288.66
  5. Step 5: Solve for x
    x = 2,422,429,288.66/79,486.88
  6. Step 6: Final answer
    x = 30,475.84

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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.