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Finding the Fourth Proportional to 212.24, 318.48 and 84

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Solution

The fourth proportional to 212.24, 318.48 and 84 is: 126.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    212.24 : 318.48 = 84 : x
  2. Step 2: Convert to fraction form
    212.24/318.48 = 84/x
  3. Step 3: Cross multiply
    212.24x = 318.48 × 84
  4. Step 4: Simplify right side
    212.24x = 26,752.32
  5. Step 5: Solve for x
    x = 26,752.32/212.24
  6. Step 6: Final answer
    x = 126.05

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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.