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Finding the Fourth Proportional to 2,103.20, 3,155.12 and 642.08

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Solution

The fourth proportional to 2,103.20, 3,155.12 and 642.08 is: 963.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,103.20 : 3,155.12 = 642.08 : x
  2. Step 2: Convert to fraction form
    2,103.20/3,155.12 = 642.08/x
  3. Step 3: Cross multiply
    2,103.20x = 3,155.12 × 642.08
  4. Step 4: Simplify right side
    2,103.20x = 2,025,839.45
  5. Step 5: Solve for x
    x = 2,025,839.45/2,103.20
  6. Step 6: Final answer
    x = 963.22

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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.