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Finding the Fourth Proportional to 712.07, 1,069.26 and 439.89

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Solution

The fourth proportional to 712.07, 1,069.26 and 439.89 is: 660.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.07 : 1,069.26 = 439.89 : x
  2. Step 2: Convert to fraction form
    712.07/1,069.26 = 439.89/x
  3. Step 3: Cross multiply
    712.07x = 1,069.26 × 439.89
  4. Step 4: Simplify right side
    712.07x = 470,356.78
  5. Step 5: Solve for x
    x = 470,356.78/712.07
  6. Step 6: Final answer
    x = 660.55

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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.