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Finding the Fourth Proportional to 1,398.70, 2,099.16 and 741.28

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Solution

The fourth proportional to 1,398.70, 2,099.16 and 741.28 is: 1,112.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.70 : 2,099.16 = 741.28 : x
  2. Step 2: Convert to fraction form
    1,398.70/2,099.16 = 741.28/x
  3. Step 3: Cross multiply
    1,398.70x = 2,099.16 × 741.28
  4. Step 4: Simplify right side
    1,398.70x = 1,556,061.62
  5. Step 5: Solve for x
    x = 1,556,061.62/1,398.70
  6. Step 6: Final answer
    x = 1,112.51

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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.