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Finding the Fourth Proportional to 215.40, 321.37 and 192.30

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Solution

The fourth proportional to 215.40, 321.37 and 192.30 is: 286.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.40 : 321.37 = 192.30 : x
  2. Step 2: Convert to fraction form
    215.40/321.37 = 192.30/x
  3. Step 3: Cross multiply
    215.40x = 321.37 × 192.30
  4. Step 4: Simplify right side
    215.40x = 61,799.45
  5. Step 5: Solve for x
    x = 61,799.45/215.40
  6. Step 6: Final answer
    x = 286.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.