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Finding the Fourth Proportional to 648.70, 973.06 and 215.89

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Solution

The fourth proportional to 648.70, 973.06 and 215.89 is: 323.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.70 : 973.06 = 215.89 : x
  2. Step 2: Convert to fraction form
    648.70/973.06 = 215.89/x
  3. Step 3: Cross multiply
    648.70x = 973.06 × 215.89
  4. Step 4: Simplify right side
    648.70x = 210,073.92
  5. Step 5: Solve for x
    x = 210,073.92/648.70
  6. Step 6: Final answer
    x = 323.84

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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.