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Finding the Fourth Proportional to 1,097.72, 1,514.85 and 818.19

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Solution

The fourth proportional to 1,097.72, 1,514.85 and 818.19 is: 1,129.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,097.72 : 1,514.85 = 818.19 : x
  2. Step 2: Convert to fraction form
    1,097.72/1,514.85 = 818.19/x
  3. Step 3: Cross multiply
    1,097.72x = 1,514.85 × 818.19
  4. Step 4: Simplify right side
    1,097.72x = 1,239,440.92
  5. Step 5: Solve for x
    x = 1,239,440.92/1,097.72
  6. Step 6: Final answer
    x = 1,129.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.