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Finding the Fourth Proportional to 85,851.70, 128,787.15 and 26,686.90

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Solution

The fourth proportional to 85,851.70, 128,787.15 and 26,686.90 is: 40,033.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,851.70 : 128,787.15 = 26,686.90 : x
  2. Step 2: Convert to fraction form
    85,851.70/128,787.15 = 26,686.90/x
  3. Step 3: Cross multiply
    85,851.70x = 128,787.15 × 26,686.90
  4. Step 4: Simplify right side
    85,851.70x = 3,436,929,793.34
  5. Step 5: Solve for x
    x = 3,436,929,793.34/85,851.70
  6. Step 6: Final answer
    x = 40,033.33

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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.