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Finding the Fourth Proportional to 648.61, 972.38 and 443.58

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Solution

The fourth proportional to 648.61, 972.38 and 443.58 is: 665.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.61 : 972.38 = 443.58 : x
  2. Step 2: Convert to fraction form
    648.61/972.38 = 443.58/x
  3. Step 3: Cross multiply
    648.61x = 972.38 × 443.58
  4. Step 4: Simplify right side
    648.61x = 431,324.54
  5. Step 5: Solve for x
    x = 431,324.54/648.61
  6. Step 6: Final answer
    x = 665.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.