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Finding the Fourth Proportional to 78,909, 108,897.66 and 45,375

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Solution

The fourth proportional to 78,909, 108,897.66 and 45,375 is: 62,619.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,909 : 108,897.66 = 45,375 : x
  2. Step 2: Convert to fraction form
    78,909/108,897.66 = 45,375/x
  3. Step 3: Cross multiply
    78,909x = 108,897.66 × 45,375
  4. Step 4: Simplify right side
    78,909x = 4,941,231,322.50
  5. Step 5: Solve for x
    x = 4,941,231,322.50/78,909
  6. Step 6: Final answer
    x = 62,619.36

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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.