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Finding the Fourth Proportional to 212.82, 319.14 and 66.53

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Solution

The fourth proportional to 212.82, 319.14 and 66.53 is: 99.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.82 : 319.14 = 66.53 : x
  2. Step 2: Convert to fraction form
    212.82/319.14 = 66.53/x
  3. Step 3: Cross multiply
    212.82x = 319.14 × 66.53
  4. Step 4: Simplify right side
    212.82x = 21,232.71
  5. Step 5: Solve for x
    x = 21,232.71/212.82
  6. Step 6: Final answer
    x = 99.77

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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.