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Finding the Fourth Proportional to 1,211.78, 1,818.48 and 442.28

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Solution

The fourth proportional to 1,211.78, 1,818.48 and 442.28 is: 663.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.78 : 1,818.48 = 442.28 : x
  2. Step 2: Convert to fraction form
    1,211.78/1,818.48 = 442.28/x
  3. Step 3: Cross multiply
    1,211.78x = 1,818.48 × 442.28
  4. Step 4: Simplify right side
    1,211.78x = 804,277.33
  5. Step 5: Solve for x
    x = 804,277.33/1,211.78
  6. Step 6: Final answer
    x = 663.72

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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.