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Finding the Fourth Proportional to 213.60, 319.80 and 172.92

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Solution

The fourth proportional to 213.60, 319.80 and 172.92 is: 258.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.60 : 319.80 = 172.92 : x
  2. Step 2: Convert to fraction form
    213.60/319.80 = 172.92/x
  3. Step 3: Cross multiply
    213.60x = 319.80 × 172.92
  4. Step 4: Simplify right side
    213.60x = 55,299.82
  5. Step 5: Solve for x
    x = 55,299.82/213.60
  6. Step 6: Final answer
    x = 258.89

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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.