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Finding the Fourth Proportional to 66,872.80, 100,309.74 and 54,378.28

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Solution

The fourth proportional to 66,872.80, 100,309.74 and 54,378.28 is: 81,567.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,872.80 : 100,309.74 = 54,378.28 : x
  2. Step 2: Convert to fraction form
    66,872.80/100,309.74 = 54,378.28/x
  3. Step 3: Cross multiply
    66,872.80x = 100,309.74 × 54,378.28
  4. Step 4: Simplify right side
    66,872.80x = 5,454,671,128.45
  5. Step 5: Solve for x
    x = 5,454,671,128.45/66,872.80
  6. Step 6: Final answer
    x = 81,567.86

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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.