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Finding the Fourth Proportional to 708.90, 1,063.56 and 343.70

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Solution

The fourth proportional to 708.90, 1,063.56 and 343.70 is: 515.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.90 : 1,063.56 = 343.70 : x
  2. Step 2: Convert to fraction form
    708.90/1,063.56 = 343.70/x
  3. Step 3: Cross multiply
    708.90x = 1,063.56 × 343.70
  4. Step 4: Simplify right side
    708.90x = 365,538.54
  5. Step 5: Solve for x
    x = 365,538.54/708.90
  6. Step 6: Final answer
    x = 515.65

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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.