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Finding the Fourth Proportional to 712.78, 1,069.32 and 404.78

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Solution

The fourth proportional to 712.78, 1,069.32 and 404.78 is: 607.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.78 : 1,069.32 = 404.78 : x
  2. Step 2: Convert to fraction form
    712.78/1,069.32 = 404.78/x
  3. Step 3: Cross multiply
    712.78x = 1,069.32 × 404.78
  4. Step 4: Simplify right side
    712.78x = 432,839.35
  5. Step 5: Solve for x
    x = 432,839.35/712.78
  6. Step 6: Final answer
    x = 607.26

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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.