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Finding the Fourth Proportional to 740.11, 1,021.34 and 408.54

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Solution

The fourth proportional to 740.11, 1,021.34 and 408.54 is: 563.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.11 : 1,021.34 = 408.54 : x
  2. Step 2: Convert to fraction form
    740.11/1,021.34 = 408.54/x
  3. Step 3: Cross multiply
    740.11x = 1,021.34 × 408.54
  4. Step 4: Simplify right side
    740.11x = 417,253.14
  5. Step 5: Solve for x
    x = 417,253.14/740.11
  6. Step 6: Final answer
    x = 563.77

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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.