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Finding the Fourth Proportional to 85,518.75, 128,278.13 and 26,354.43

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Solution

The fourth proportional to 85,518.75, 128,278.13 and 26,354.43 is: 39,531.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,518.75 : 128,278.13 = 26,354.43 : x
  2. Step 2: Convert to fraction form
    85,518.75/128,278.13 = 26,354.43/x
  3. Step 3: Cross multiply
    85,518.75x = 128,278.13 × 26,354.43
  4. Step 4: Simplify right side
    85,518.75x = 3,380,696,865.84
  5. Step 5: Solve for x
    x = 3,380,696,865.84/85,518.75
  6. Step 6: Final answer
    x = 39,531.65

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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.