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Finding the Fourth Proportional to 74,424.30, 111,636.45 and 68,721.90

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Solution

The fourth proportional to 74,424.30, 111,636.45 and 68,721.90 is: 103,082.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,424.30 : 111,636.45 = 68,721.90 : x
  2. Step 2: Convert to fraction form
    74,424.30/111,636.45 = 68,721.90/x
  3. Step 3: Cross multiply
    74,424.30x = 111,636.45 × 68,721.90
  4. Step 4: Simplify right side
    74,424.30x = 7,671,868,953.26
  5. Step 5: Solve for x
    x = 7,671,868,953.26/74,424.30
  6. Step 6: Final answer
    x = 103,082.85

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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.