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Finding the Fourth Proportional to 72,911, 100,617.18 and 39,377

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Solution

The fourth proportional to 72,911, 100,617.18 and 39,377 is: 54,340.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,911 : 100,617.18 = 39,377 : x
  2. Step 2: Convert to fraction form
    72,911/100,617.18 = 39,377/x
  3. Step 3: Cross multiply
    72,911x = 100,617.18 × 39,377
  4. Step 4: Simplify right side
    72,911x = 3,962,002,696.86
  5. Step 5: Solve for x
    x = 3,962,002,696.86/72,911
  6. Step 6: Final answer
    x = 54,340.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.