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Finding the Fourth Proportional to 1,335.74, 2,003.30 and 641.97

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Solution

The fourth proportional to 1,335.74, 2,003.30 and 641.97 is: 962.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.74 : 2,003.30 = 641.97 : x
  2. Step 2: Convert to fraction form
    1,335.74/2,003.30 = 641.97/x
  3. Step 3: Cross multiply
    1,335.74x = 2,003.30 × 641.97
  4. Step 4: Simplify right side
    1,335.74x = 1,286,065.11
  5. Step 5: Solve for x
    x = 1,286,065.11/1,335.74
  6. Step 6: Final answer
    x = 962.81

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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.