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Finding the Fourth Proportional to 78,872.93, 118,120.78 and 45,491.79

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Solution

The fourth proportional to 78,872.93, 118,120.78 and 45,491.79 is: 68,128.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,872.93 : 118,120.78 = 45,491.79 : x
  2. Step 2: Convert to fraction form
    78,872.93/118,120.78 = 45,491.79/x
  3. Step 3: Cross multiply
    78,872.93x = 118,120.78 × 45,491.79
  4. Step 4: Simplify right side
    78,872.93x = 5,373,525,718.40
  5. Step 5: Solve for x
    x = 5,373,525,718.40/78,872.93
  6. Step 6: Final answer
    x = 68,128.90

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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.