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Finding the Fourth Proportional to 712.20, 1,069.26 and 404.62

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Solution

The fourth proportional to 712.20, 1,069.26 and 404.62 is: 607.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.20 : 1,069.26 = 404.62 : x
  2. Step 2: Convert to fraction form
    712.20/1,069.26 = 404.62/x
  3. Step 3: Cross multiply
    712.20x = 1,069.26 × 404.62
  4. Step 4: Simplify right side
    712.20x = 432,643.98
  5. Step 5: Solve for x
    x = 432,643.98/712.20
  6. Step 6: Final answer
    x = 607.48

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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.