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Finding the Fourth Proportional to 712.18, 1,069.08 and 665.20

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Solution

The fourth proportional to 712.18, 1,069.08 and 665.20 is: 998.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.18 : 1,069.08 = 665.20 : x
  2. Step 2: Convert to fraction form
    712.18/1,069.08 = 665.20/x
  3. Step 3: Cross multiply
    712.18x = 1,069.08 × 665.20
  4. Step 4: Simplify right side
    712.18x = 711,152.02
  5. Step 5: Solve for x
    x = 711,152.02/712.18
  6. Step 6: Final answer
    x = 998.56

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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.