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Finding the Fourth Proportional to 216.98, 325.53 and 72.70

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Solution

The fourth proportional to 216.98, 325.53 and 72.70 is: 109.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.98 : 325.53 = 72.70 : x
  2. Step 2: Convert to fraction form
    216.98/325.53 = 72.70/x
  3. Step 3: Cross multiply
    216.98x = 325.53 × 72.70
  4. Step 4: Simplify right side
    216.98x = 23,667.05
  5. Step 5: Solve for x
    x = 23,667.05/216.98
  6. Step 6: Final answer
    x = 109.07

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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.