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Finding the Fourth Proportional to 712.36, 1,069.02 and 663.40

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Solution

The fourth proportional to 712.36, 1,069.02 and 663.40 is: 995.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.36 : 1,069.02 = 663.40 : x
  2. Step 2: Convert to fraction form
    712.36/1,069.02 = 663.40/x
  3. Step 3: Cross multiply
    712.36x = 1,069.02 × 663.40
  4. Step 4: Simplify right side
    712.36x = 709,187.87
  5. Step 5: Solve for x
    x = 709,187.87/712.36
  6. Step 6: Final answer
    x = 995.55

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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.