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Finding the Fourth Proportional to 732.79, 1,097.96 and 640.45

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Solution

The fourth proportional to 732.79, 1,097.96 and 640.45 is: 959.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    732.79 : 1,097.96 = 640.45 : x
  2. Step 2: Convert to fraction form
    732.79/1,097.96 = 640.45/x
  3. Step 3: Cross multiply
    732.79x = 1,097.96 × 640.45
  4. Step 4: Simplify right side
    732.79x = 703,182.99
  5. Step 5: Solve for x
    x = 703,182.99/732.79
  6. Step 6: Final answer
    x = 959.60

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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.