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Finding the Fourth Proportional to 78,918.88, 108,907.40 and 43,108.90

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Solution

The fourth proportional to 78,918.88, 108,907.40 and 43,108.90 is: 59,489.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,918.88 : 108,907.40 = 43,108.90 : x
  2. Step 2: Convert to fraction form
    78,918.88/108,907.40 = 43,108.90/x
  3. Step 3: Cross multiply
    78,918.88x = 108,907.40 × 43,108.90
  4. Step 4: Simplify right side
    78,918.88x = 4,694,878,215.86
  5. Step 5: Solve for x
    x = 4,694,878,215.86/78,918.88
  6. Step 6: Final answer
    x = 59,489.92

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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.