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Finding the Fourth Proportional to 215.19, 324.54 and 207.90

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Solution

The fourth proportional to 215.19, 324.54 and 207.90 is: 313.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.19 : 324.54 = 207.90 : x
  2. Step 2: Convert to fraction form
    215.19/324.54 = 207.90/x
  3. Step 3: Cross multiply
    215.19x = 324.54 × 207.90
  4. Step 4: Simplify right side
    215.19x = 67,471.87
  5. Step 5: Solve for x
    x = 67,471.87/215.19
  6. Step 6: Final answer
    x = 313.55

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.