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Finding the Fourth Proportional to 215.95, 324.05 and 79.00

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Solution

The fourth proportional to 215.95, 324.05 and 79.00 is: 118.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.95 : 324.05 = 79.00 : x
  2. Step 2: Convert to fraction form
    215.95/324.05 = 79.00/x
  3. Step 3: Cross multiply
    215.95x = 324.05 × 79.00
  4. Step 4: Simplify right side
    215.95x = 25,601.47
  5. Step 5: Solve for x
    x = 25,601.47/215.95
  6. Step 6: Final answer
    x = 118.55

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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.