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Finding the Fourth Proportional to 247,155.90, 370,647.45 and 128,787.90

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Solution

The fourth proportional to 247,155.90, 370,647.45 and 128,787.90 is: 193,136.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    247,155.90 : 370,647.45 = 128,787.90 : x
  2. Step 2: Convert to fraction form
    247,155.90/370,647.45 = 128,787.90/x
  3. Step 3: Cross multiply
    247,155.90x = 370,647.45 × 128,787.90
  4. Step 4: Simplify right side
    247,155.90x = 47,734,906,725.86
  5. Step 5: Solve for x
    x = 47,734,906,725.86/247,155.90
  6. Step 6: Final answer
    x = 193,136.83

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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.