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Finding the Fourth Proportional to 1,387.65, 2,082.30 and 738.39

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Solution

The fourth proportional to 1,387.65, 2,082.30 and 738.39 is: 1,108.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.65 : 2,082.30 = 738.39 : x
  2. Step 2: Convert to fraction form
    1,387.65/2,082.30 = 738.39/x
  3. Step 3: Cross multiply
    1,387.65x = 2,082.30 × 738.39
  4. Step 4: Simplify right side
    1,387.65x = 1,537,549.50
  5. Step 5: Solve for x
    x = 1,537,549.50/1,387.65
  6. Step 6: Final answer
    x = 1,108.02

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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.