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Finding the Fourth Proportional to 1,211.38, 1,818.28 and 865.12

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Solution

The fourth proportional to 1,211.38, 1,818.28 and 865.12 is: 1,298.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.38 : 1,818.28 = 865.12 : x
  2. Step 2: Convert to fraction form
    1,211.38/1,818.28 = 865.12/x
  3. Step 3: Cross multiply
    1,211.38x = 1,818.28 × 865.12
  4. Step 4: Simplify right side
    1,211.38x = 1,573,030.39
  5. Step 5: Solve for x
    x = 1,573,030.39/1,211.38
  6. Step 6: Final answer
    x = 1,298.54

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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.