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Finding the Fourth Proportional to 100,153.80, 138,212.28 and 54,834.66

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Solution

The fourth proportional to 100,153.80, 138,212.28 and 54,834.66 is: 75,671.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,153.80 : 138,212.28 = 54,834.66 : x
  2. Step 2: Convert to fraction form
    100,153.80/138,212.28 = 54,834.66/x
  3. Step 3: Cross multiply
    100,153.80x = 138,212.28 × 54,834.66
  4. Step 4: Simplify right side
    100,153.80x = 7,578,823,381.62
  5. Step 5: Solve for x
    x = 7,578,823,381.62/100,153.80
  6. Step 6: Final answer
    x = 75,671.85

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1.5x scale

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.