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Finding the Fourth Proportional to 1,335.65, 2,001.80 and 641.75

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Solution

The fourth proportional to 1,335.65, 2,001.80 and 641.75 is: 961.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.65 : 2,001.80 = 641.75 : x
  2. Step 2: Convert to fraction form
    1,335.65/2,001.80 = 641.75/x
  3. Step 3: Cross multiply
    1,335.65x = 2,001.80 × 641.75
  4. Step 4: Simplify right side
    1,335.65x = 1,284,655.15
  5. Step 5: Solve for x
    x = 1,284,655.15/1,335.65
  6. Step 6: Final answer
    x = 961.82

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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.