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Finding the Fourth Proportional to 218,691.15, 328,064.49 and 85,554.33

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Solution

The fourth proportional to 218,691.15, 328,064.49 and 85,554.33 is: 128,342.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,691.15 : 328,064.49 = 85,554.33 : x
  2. Step 2: Convert to fraction form
    218,691.15/328,064.49 = 85,554.33/x
  3. Step 3: Cross multiply
    218,691.15x = 328,064.49 × 85,554.33
  4. Step 4: Simplify right side
    218,691.15x = 28,067,337,638.74
  5. Step 5: Solve for x
    x = 28,067,337,638.74/218,691.15
  6. Step 6: Final answer
    x = 128,342.36

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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.