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Finding the Fourth Proportional to 712.79, 1,069.31 and 347.54

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Solution

The fourth proportional to 712.79, 1,069.31 and 347.54 is: 521.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.79 : 1,069.31 = 347.54 : x
  2. Step 2: Convert to fraction form
    712.79/1,069.31 = 347.54/x
  3. Step 3: Cross multiply
    712.79x = 1,069.31 × 347.54
  4. Step 4: Simplify right side
    712.79x = 371,628.00
  5. Step 5: Solve for x
    x = 371,628.00/712.79
  6. Step 6: Final answer
    x = 521.37

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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.