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Finding the Fourth Proportional to 740.21, 1,021.43 and 408.51

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Solution

The fourth proportional to 740.21, 1,021.43 and 408.51 is: 563.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.21 : 1,021.43 = 408.51 : x
  2. Step 2: Convert to fraction form
    740.21/1,021.43 = 408.51/x
  3. Step 3: Cross multiply
    740.21x = 1,021.43 × 408.51
  4. Step 4: Simplify right side
    740.21x = 417,265.39
  5. Step 5: Solve for x
    x = 417,265.39/740.21
  6. Step 6: Final answer
    x = 563.72

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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.