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Finding the Fourth Proportional to 987.65, 1,481.70 and 338.38

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Solution

The fourth proportional to 987.65, 1,481.70 and 338.38 is: 507.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.65 : 1,481.70 = 338.38 : x
  2. Step 2: Convert to fraction form
    987.65/1,481.70 = 338.38/x
  3. Step 3: Cross multiply
    987.65x = 1,481.70 × 338.38
  4. Step 4: Simplify right side
    987.65x = 501,377.65
  5. Step 5: Solve for x
    x = 501,377.65/987.65
  6. Step 6: Final answer
    x = 507.65

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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.