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Finding the Fourth Proportional to 78,620.90, 108,505.50 and 48,400.16

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Solution

The fourth proportional to 78,620.90, 108,505.50 and 48,400.16 is: 66,797.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,620.90 : 108,505.50 = 48,400.16 : x
  2. Step 2: Convert to fraction form
    78,620.90/108,505.50 = 48,400.16/x
  3. Step 3: Cross multiply
    78,620.90x = 108,505.50 × 48,400.16
  4. Step 4: Simplify right side
    78,620.90x = 5,251,683,560.88
  5. Step 5: Solve for x
    x = 5,251,683,560.88/78,620.90
  6. Step 6: Final answer
    x = 66,797.55

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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.