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Finding the Fourth Proportional to 74,691.60, 112,037.40 and 68,989.20

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Solution

The fourth proportional to 74,691.60, 112,037.40 and 68,989.20 is: 103,483.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,691.60 : 112,037.40 = 68,989.20 : x
  2. Step 2: Convert to fraction form
    74,691.60/112,037.40 = 68,989.20/x
  3. Step 3: Cross multiply
    74,691.60x = 112,037.40 × 68,989.20
  4. Step 4: Simplify right side
    74,691.60x = 7,729,370,596.08
  5. Step 5: Solve for x
    x = 7,729,370,596.08/74,691.60
  6. Step 6: Final answer
    x = 103,483.80

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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.