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Finding the Fourth Proportional to 704.70, 972.48 and 389.97

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Solution

The fourth proportional to 704.70, 972.48 and 389.97 is: 538.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.70 : 972.48 = 389.97 : x
  2. Step 2: Convert to fraction form
    704.70/972.48 = 389.97/x
  3. Step 3: Cross multiply
    704.70x = 972.48 × 389.97
  4. Step 4: Simplify right side
    704.70x = 379,238.03
  5. Step 5: Solve for x
    x = 379,238.03/704.70
  6. Step 6: Final answer
    x = 538.16

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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.