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Finding the Fourth Proportional to 648.21, 971.67 and 215.10

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Solution

The fourth proportional to 648.21, 971.67 and 215.10 is: 322.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.21 : 971.67 = 215.10 : x
  2. Step 2: Convert to fraction form
    648.21/971.67 = 215.10/x
  3. Step 3: Cross multiply
    648.21x = 971.67 × 215.10
  4. Step 4: Simplify right side
    648.21x = 209,006.22
  5. Step 5: Solve for x
    x = 209,006.22/648.21
  6. Step 6: Final answer
    x = 322.44

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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.