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Finding the Fourth Proportional to 740.87, 1,022.41 and 409.29

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Solution

The fourth proportional to 740.87, 1,022.41 and 409.29 is: 564.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.87 : 1,022.41 = 409.29 : x
  2. Step 2: Convert to fraction form
    740.87/1,022.41 = 409.29/x
  3. Step 3: Cross multiply
    740.87x = 1,022.41 × 409.29
  4. Step 4: Simplify right side
    740.87x = 418,458.87
  5. Step 5: Solve for x
    x = 418,458.87/740.87
  6. Step 6: Final answer
    x = 564.82

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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.