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Finding the Fourth Proportional to 251.58, 375.30 and 215.28

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Solution

The fourth proportional to 251.58, 375.30 and 215.28 is: 321.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.58 : 375.30 = 215.28 : x
  2. Step 2: Convert to fraction form
    251.58/375.30 = 215.28/x
  3. Step 3: Cross multiply
    251.58x = 375.30 × 215.28
  4. Step 4: Simplify right side
    251.58x = 80,794.58
  5. Step 5: Solve for x
    x = 80,794.58/251.58
  6. Step 6: Final answer
    x = 321.15

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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.