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Finding the Fourth Proportional to 648.78, 974.48 and 389.27

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Solution

The fourth proportional to 648.78, 974.48 and 389.27 is: 584.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.78 : 974.48 = 389.27 : x
  2. Step 2: Convert to fraction form
    648.78/974.48 = 389.27/x
  3. Step 3: Cross multiply
    648.78x = 974.48 × 389.27
  4. Step 4: Simplify right side
    648.78x = 379,341.18
  5. Step 5: Solve for x
    x = 379,341.18/648.78
  6. Step 6: Final answer
    x = 584.70

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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.