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Finding the Fourth Proportional to 714.79, 1,072.44 and 385.39

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Solution

The fourth proportional to 714.79, 1,072.44 and 385.39 is: 578.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.79 : 1,072.44 = 385.39 : x
  2. Step 2: Convert to fraction form
    714.79/1,072.44 = 385.39/x
  3. Step 3: Cross multiply
    714.79x = 1,072.44 × 385.39
  4. Step 4: Simplify right side
    714.79x = 413,308.99
  5. Step 5: Solve for x
    x = 413,308.99/714.79
  6. Step 6: Final answer
    x = 578.22

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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.