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Finding the Fourth Proportional to 712.69, 1,069.10 and 365.87

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Solution

The fourth proportional to 712.69, 1,069.10 and 365.87 is: 548.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.69 : 1,069.10 = 365.87 : x
  2. Step 2: Convert to fraction form
    712.69/1,069.10 = 365.87/x
  3. Step 3: Cross multiply
    712.69x = 1,069.10 × 365.87
  4. Step 4: Simplify right side
    712.69x = 391,151.62
  5. Step 5: Solve for x
    x = 391,151.62/712.69
  6. Step 6: Final answer
    x = 548.84

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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.