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Finding the Fourth Proportional to 712.78, 1,069.08 and 347.48

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Solution

The fourth proportional to 712.78, 1,069.08 and 347.48 is: 521.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.78 : 1,069.08 = 347.48 : x
  2. Step 2: Convert to fraction form
    712.78/1,069.08 = 347.48/x
  3. Step 3: Cross multiply
    712.78x = 1,069.08 × 347.48
  4. Step 4: Simplify right side
    712.78x = 371,483.92
  5. Step 5: Solve for x
    x = 371,483.92/712.78
  6. Step 6: Final answer
    x = 521.18

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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.