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Finding the Fourth Proportional to 3,335.72, 5,005.78 and 1,387.92

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Solution

The fourth proportional to 3,335.72, 5,005.78 and 1,387.92 is: 2,082.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,335.72 : 5,005.78 = 1,387.92 : x
  2. Step 2: Convert to fraction form
    3,335.72/5,005.78 = 1,387.92/x
  3. Step 3: Cross multiply
    3,335.72x = 5,005.78 × 1,387.92
  4. Step 4: Simplify right side
    3,335.72x = 6,947,622.18
  5. Step 5: Solve for x
    x = 6,947,622.18/3,335.72
  6. Step 6: Final answer
    x = 2,082.80

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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.