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Finding the Fourth Proportional to 78,608, 108,479.04 and 43,280

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Solution

The fourth proportional to 78,608, 108,479.04 and 43,280 is: 59,726.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,608 : 108,479.04 = 43,280 : x
  2. Step 2: Convert to fraction form
    78,608/108,479.04 = 43,280/x
  3. Step 3: Cross multiply
    78,608x = 108,479.04 × 43,280
  4. Step 4: Simplify right side
    78,608x = 4,694,972,851.20
  5. Step 5: Solve for x
    x = 4,694,972,851.20/78,608
  6. Step 6: Final answer
    x = 59,726.40

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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.