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Finding the Fourth Proportional to 714.78, 1,072.16 and 221.19

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Solution

The fourth proportional to 714.78, 1,072.16 and 221.19 is: 331.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.78 : 1,072.16 = 221.19 : x
  2. Step 2: Convert to fraction form
    714.78/1,072.16 = 221.19/x
  3. Step 3: Cross multiply
    714.78x = 1,072.16 × 221.19
  4. Step 4: Simplify right side
    714.78x = 237,151.07
  5. Step 5: Solve for x
    x = 237,151.07/714.78
  6. Step 6: Final answer
    x = 331.78

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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.