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Finding the Fourth Proportional to 74,989.80, 112,428.70 and 45,400.52

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Solution

The fourth proportional to 74,989.80, 112,428.70 and 45,400.52 is: 68,066.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,989.80 : 112,428.70 = 45,400.52 : x
  2. Step 2: Convert to fraction form
    74,989.80/112,428.70 = 45,400.52/x
  3. Step 3: Cross multiply
    74,989.80x = 112,428.70 × 45,400.52
  4. Step 4: Simplify right side
    74,989.80x = 5,104,321,442.92
  5. Step 5: Solve for x
    x = 5,104,321,442.92/74,989.80
  6. Step 6: Final answer
    x = 68,066.88

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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.