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Finding the Fourth Proportional to 648.24, 972.36 and 215.40

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Solution

The fourth proportional to 648.24, 972.36 and 215.40 is: 323.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.24 : 972.36 = 215.40 : x
  2. Step 2: Convert to fraction form
    648.24/972.36 = 215.40/x
  3. Step 3: Cross multiply
    648.24x = 972.36 × 215.40
  4. Step 4: Simplify right side
    648.24x = 209,446.34
  5. Step 5: Solve for x
    x = 209,446.34/648.24
  6. Step 6: Final answer
    x = 323.10

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Similar ratio
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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.