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Finding the Fourth Proportional to 704.20, 972.39 and 442.30

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Solution

The fourth proportional to 704.20, 972.39 and 442.30 is: 610.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.20 : 972.39 = 442.30 : x
  2. Step 2: Convert to fraction form
    704.20/972.39 = 442.30/x
  3. Step 3: Cross multiply
    704.20x = 972.39 × 442.30
  4. Step 4: Simplify right side
    704.20x = 430,088.10
  5. Step 5: Solve for x
    x = 430,088.10/704.20
  6. Step 6: Final answer
    x = 610.75

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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.