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Finding the Fourth Proportional to 71,978.21, 99,329.99 and 41,769.66

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Solution

The fourth proportional to 71,978.21, 99,329.99 and 41,769.66 is: 57,642.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,978.21 : 99,329.99 = 41,769.66 : x
  2. Step 2: Convert to fraction form
    71,978.21/99,329.99 = 41,769.66/x
  3. Step 3: Cross multiply
    71,978.21x = 99,329.99 × 41,769.66
  4. Step 4: Simplify right side
    71,978.21x = 4,148,979,701.26
  5. Step 5: Solve for x
    x = 4,148,979,701.26/71,978.21
  6. Step 6: Final answer
    x = 57,642.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.