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Finding the Fourth Proportional to 2,102.60, 3,154.41 and 641.78

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Solution

The fourth proportional to 2,102.60, 3,154.41 and 641.78 is: 962.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,102.60 : 3,154.41 = 641.78 : x
  2. Step 2: Convert to fraction form
    2,102.60/3,154.41 = 641.78/x
  3. Step 3: Cross multiply
    2,102.60x = 3,154.41 × 641.78
  4. Step 4: Simplify right side
    2,102.60x = 2,024,437.25
  5. Step 5: Solve for x
    x = 2,024,437.25/2,102.60
  6. Step 6: Final answer
    x = 962.83

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1.5x scale

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.