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Finding the Fourth Proportional to 2,155.32, 3,232.86 and 768.60

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Solution

The fourth proportional to 2,155.32, 3,232.86 and 768.60 is: 1,152.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.32 : 3,232.86 = 768.60 : x
  2. Step 2: Convert to fraction form
    2,155.32/3,232.86 = 768.60/x
  3. Step 3: Cross multiply
    2,155.32x = 3,232.86 × 768.60
  4. Step 4: Simplify right side
    2,155.32x = 2,484,776.20
  5. Step 5: Solve for x
    x = 2,484,776.20/2,155.32
  6. Step 6: Final answer
    x = 1,152.86

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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.