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Finding the Fourth Proportional to 74,874.80, 111,582.42 and 72,715.70

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Solution

The fourth proportional to 74,874.80, 111,582.42 and 72,715.70 is: 108,364.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,874.80 : 111,582.42 = 72,715.70 : x
  2. Step 2: Convert to fraction form
    74,874.80/111,582.42 = 72,715.70/x
  3. Step 3: Cross multiply
    74,874.80x = 111,582.42 × 72,715.70
  4. Step 4: Simplify right side
    74,874.80x = 8,113,793,220.08
  5. Step 5: Solve for x
    x = 8,113,793,220.08/74,874.80
  6. Step 6: Final answer
    x = 108,364.81

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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.