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Finding the Fourth Proportional to 216.69, 297.80 and 172.95

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Solution

The fourth proportional to 216.69, 297.80 and 172.95 is: 237.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.69 : 297.80 = 172.95 : x
  2. Step 2: Convert to fraction form
    216.69/297.80 = 172.95/x
  3. Step 3: Cross multiply
    216.69x = 297.80 × 172.95
  4. Step 4: Simplify right side
    216.69x = 51,503.65
  5. Step 5: Solve for x
    x = 51,503.65/216.69
  6. Step 6: Final answer
    x = 237.68

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.