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Finding the Fourth Proportional to 704.46, 972.08 and 389.72

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Solution

The fourth proportional to 704.46, 972.08 and 389.72 is: 537.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.46 : 972.08 = 389.72 : x
  2. Step 2: Convert to fraction form
    704.46/972.08 = 389.72/x
  3. Step 3: Cross multiply
    704.46x = 972.08 × 389.72
  4. Step 4: Simplify right side
    704.46x = 378,839.02
  5. Step 5: Solve for x
    x = 378,839.02/704.46
  6. Step 6: Final answer
    x = 537.77

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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.