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Finding the Fourth Proportional to 85,854.70, 128,791.65 and 26,689.90

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Solution

The fourth proportional to 85,854.70, 128,791.65 and 26,689.90 is: 40,037.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,854.70 : 128,791.65 = 26,689.90 : x
  2. Step 2: Convert to fraction form
    85,854.70/128,791.65 = 26,689.90/x
  3. Step 3: Cross multiply
    85,854.70x = 128,791.65 × 26,689.90
  4. Step 4: Simplify right side
    85,854.70x = 3,437,436,259.34
  5. Step 5: Solve for x
    x = 3,437,436,259.34/85,854.70
  6. Step 6: Final answer
    x = 40,037.83

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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.