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Finding the Fourth Proportional to 740.36, 1,021.68 and 408.80

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Solution

The fourth proportional to 740.36, 1,021.68 and 408.80 is: 564.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.36 : 1,021.68 = 408.80 : x
  2. Step 2: Convert to fraction form
    740.36/1,021.68 = 408.80/x
  3. Step 3: Cross multiply
    740.36x = 1,021.68 × 408.80
  4. Step 4: Simplify right side
    740.36x = 417,662.78
  5. Step 5: Solve for x
    x = 417,662.78/740.36
  6. Step 6: Final answer
    x = 564.13

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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.