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Finding the Fourth Proportional to 212.49, 318.45 and 96.76

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Solution

The fourth proportional to 212.49, 318.45 and 96.76 is: 145.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.49 : 318.45 = 96.76 : x
  2. Step 2: Convert to fraction form
    212.49/318.45 = 96.76/x
  3. Step 3: Cross multiply
    212.49x = 318.45 × 96.76
  4. Step 4: Simplify right side
    212.49x = 30,813.22
  5. Step 5: Solve for x
    x = 30,813.22/212.49
  6. Step 6: Final answer
    x = 145.01

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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.