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Finding the Fourth Proportional to 704.40, 972.20 and 409.71

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Solution

The fourth proportional to 704.40, 972.20 and 409.71 is: 565.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.40 : 972.20 = 409.71 : x
  2. Step 2: Convert to fraction form
    704.40/972.20 = 409.71/x
  3. Step 3: Cross multiply
    704.40x = 972.20 × 409.71
  4. Step 4: Simplify right side
    704.40x = 398,319.26
  5. Step 5: Solve for x
    x = 398,319.26/704.40
  6. Step 6: Final answer
    x = 565.48

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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.