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Finding the Fourth Proportional to 74,429.70, 111,644.55 and 67,431.30

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Solution

The fourth proportional to 74,429.70, 111,644.55 and 67,431.30 is: 101,146.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,429.70 : 111,644.55 = 67,431.30 : x
  2. Step 2: Convert to fraction form
    74,429.70/111,644.55 = 67,431.30/x
  3. Step 3: Cross multiply
    74,429.70x = 111,644.55 × 67,431.30
  4. Step 4: Simplify right side
    74,429.70x = 7,528,337,144.42
  5. Step 5: Solve for x
    x = 7,528,337,144.42/74,429.70
  6. Step 6: Final answer
    x = 101,146.95

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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.