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Finding the Fourth Proportional to 740.79, 1,022.24 and 409.21

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Solution

The fourth proportional to 740.79, 1,022.24 and 409.21 is: 564.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.79 : 1,022.24 = 409.21 : x
  2. Step 2: Convert to fraction form
    740.79/1,022.24 = 409.21/x
  3. Step 3: Cross multiply
    740.79x = 1,022.24 × 409.21
  4. Step 4: Simplify right side
    740.79x = 418,309.30
  5. Step 5: Solve for x
    x = 418,309.30/740.79
  6. Step 6: Final answer
    x = 564.68

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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.