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Finding the Fourth Proportional to 85,690.96, 128,542.56 and 26,519.02

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Solution

The fourth proportional to 85,690.96, 128,542.56 and 26,519.02 is: 39,780.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,690.96 : 128,542.56 = 26,519.02 : x
  2. Step 2: Convert to fraction form
    85,690.96/128,542.56 = 26,519.02/x
  3. Step 3: Cross multiply
    85,690.96x = 128,542.56 × 26,519.02
  4. Step 4: Simplify right side
    85,690.96x = 3,408,822,719.49
  5. Step 5: Solve for x
    x = 3,408,822,719.49/85,690.96
  6. Step 6: Final answer
    x = 39,780.42

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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.