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Finding the Fourth Proportional to 648, 972.20 and 417.15

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Solution

The fourth proportional to 648, 972.20 and 417.15 is: 625.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    648 : 972.20 = 417.15 : x
  2. Step 2: Convert to fraction form
    648/972.20 = 417.15/x
  3. Step 3: Cross multiply
    648x = 972.20 × 417.15
  4. Step 4: Simplify right side
    648x = 405,553.23
  5. Step 5: Solve for x
    x = 405,553.23/648
  6. Step 6: Final answer
    x = 625.85

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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.