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Finding the Fourth Proportional to 71,791.19, 99,071.85 and 39,959.41

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Solution

The fourth proportional to 71,791.19, 99,071.85 and 39,959.41 is: 55,143.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,791.19 : 99,071.85 = 39,959.41 : x
  2. Step 2: Convert to fraction form
    71,791.19/99,071.85 = 39,959.41/x
  3. Step 3: Cross multiply
    71,791.19x = 99,071.85 × 39,959.41
  4. Step 4: Simplify right side
    71,791.19x = 3,958,851,978.45
  5. Step 5: Solve for x
    x = 3,958,851,978.45/71,791.19
  6. Step 6: Final answer
    x = 55,143.98

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1.5x scale

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.