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Finding the Fourth Proportional to 1,398.11, 2,096.55 and 813.69

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Solution

The fourth proportional to 1,398.11, 2,096.55 and 813.69 is: 1,220.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.11 : 2,096.55 = 813.69 : x
  2. Step 2: Convert to fraction form
    1,398.11/2,096.55 = 813.69/x
  3. Step 3: Cross multiply
    1,398.11x = 2,096.55 × 813.69
  4. Step 4: Simplify right side
    1,398.11x = 1,705,941.77
  5. Step 5: Solve for x
    x = 1,705,941.77/1,398.11
  6. Step 6: Final answer
    x = 1,220.18

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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.