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Finding the Fourth Proportional to 71,840.88, 107,128.44 and 66,854.52

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Solution

The fourth proportional to 71,840.88, 107,128.44 and 66,854.52 is: 99,692.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,840.88 : 107,128.44 = 66,854.52 : x
  2. Step 2: Convert to fraction form
    71,840.88/107,128.44 = 66,854.52/x
  3. Step 3: Cross multiply
    71,840.88x = 107,128.44 × 66,854.52
  4. Step 4: Simplify right side
    71,840.88x = 7,162,020,434.55
  5. Step 5: Solve for x
    x = 7,162,020,434.55/71,840.88
  6. Step 6: Final answer
    x = 99,692.83

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.