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Finding the Fourth Proportional to 216.82, 325.02 and 72.45

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Solution

The fourth proportional to 216.82, 325.02 and 72.45 is: 108.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.82 : 325.02 = 72.45 : x
  2. Step 2: Convert to fraction form
    216.82/325.02 = 72.45/x
  3. Step 3: Cross multiply
    216.82x = 325.02 × 72.45
  4. Step 4: Simplify right side
    216.82x = 23,547.70
  5. Step 5: Solve for x
    x = 23,547.70/216.82
  6. Step 6: Final answer
    x = 108.60

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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.