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Finding the Fourth Proportional to 170,787.90, 256,181.85 and 131,421.90

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Solution

The fourth proportional to 170,787.90, 256,181.85 and 131,421.90 is: 197,132.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,787.90 : 256,181.85 = 131,421.90 : x
  2. Step 2: Convert to fraction form
    170,787.90/256,181.85 = 131,421.90/x
  3. Step 3: Cross multiply
    170,787.90x = 256,181.85 × 131,421.90
  4. Step 4: Simplify right side
    170,787.90x = 33,667,905,472.52
  5. Step 5: Solve for x
    x = 33,667,905,472.52/170,787.90
  6. Step 6: Final answer
    x = 197,132.85

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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.