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Finding the Fourth Proportional to 740.62, 1,021.44 and 636.70

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Solution

The fourth proportional to 740.62, 1,021.44 and 636.70 is: 878.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.62 : 1,021.44 = 636.70 : x
  2. Step 2: Convert to fraction form
    740.62/1,021.44 = 636.70/x
  3. Step 3: Cross multiply
    740.62x = 1,021.44 × 636.70
  4. Step 4: Simplify right side
    740.62x = 650,350.85
  5. Step 5: Solve for x
    x = 650,350.85/740.62
  6. Step 6: Final answer
    x = 878.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.