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Finding the Fourth Proportional to 716.94, 1,069.11 and 664.02

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Solution

The fourth proportional to 716.94, 1,069.11 and 664.02 is: 990.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.94 : 1,069.11 = 664.02 : x
  2. Step 2: Convert to fraction form
    716.94/1,069.11 = 664.02/x
  3. Step 3: Cross multiply
    716.94x = 1,069.11 × 664.02
  4. Step 4: Simplify right side
    716.94x = 709,910.42
  5. Step 5: Solve for x
    x = 709,910.42/716.94
  6. Step 6: Final answer
    x = 990.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.