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Finding the Fourth Proportional to 1,398.50, 2,098.13 and 1,245.48

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Solution

The fourth proportional to 1,398.50, 2,098.13 and 1,245.48 is: 1,868.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.50 : 2,098.13 = 1,245.48 : x
  2. Step 2: Convert to fraction form
    1,398.50/2,098.13 = 1,245.48/x
  3. Step 3: Cross multiply
    1,398.50x = 2,098.13 × 1,245.48
  4. Step 4: Simplify right side
    1,398.50x = 2,613,164.86
  5. Step 5: Solve for x
    x = 2,613,164.86/1,398.50
  6. Step 6: Final answer
    x = 1,868.55

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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.