Home / 1,211.89-1,818.09-442.39

Finding the Fourth Proportional to 1,211.89, 1,818.09 and 442.39

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Solution

The fourth proportional to 1,211.89, 1,818.09 and 442.39 is: 663.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.89 : 1,818.09 = 442.39 : x
  2. Step 2: Convert to fraction form
    1,211.89/1,818.09 = 442.39/x
  3. Step 3: Cross multiply
    1,211.89x = 1,818.09 × 442.39
  4. Step 4: Simplify right side
    1,211.89x = 804,304.84
  5. Step 5: Solve for x
    x = 804,304.84/1,211.89
  6. Step 6: Final answer
    x = 663.68

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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.