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Finding the Fourth Proportional to 704.56, 972.28 and 389.79

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Solution

The fourth proportional to 704.56, 972.28 and 389.79 is: 537.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.56 : 972.28 = 389.79 : x
  2. Step 2: Convert to fraction form
    704.56/972.28 = 389.79/x
  3. Step 3: Cross multiply
    704.56x = 972.28 × 389.79
  4. Step 4: Simplify right side
    704.56x = 378,985.02
  5. Step 5: Solve for x
    x = 378,985.02/704.56
  6. Step 6: Final answer
    x = 537.90

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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.