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Finding the Fourth Proportional to 694.20, 1,041.50 and 347.12

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Solution

The fourth proportional to 694.20, 1,041.50 and 347.12 is: 520.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.20 : 1,041.50 = 347.12 : x
  2. Step 2: Convert to fraction form
    694.20/1,041.50 = 347.12/x
  3. Step 3: Cross multiply
    694.20x = 1,041.50 × 347.12
  4. Step 4: Simplify right side
    694.20x = 361,525.48
  5. Step 5: Solve for x
    x = 361,525.48/694.20
  6. Step 6: Final answer
    x = 520.78

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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.