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Finding the Fourth Proportional to 213.60, 318.03 and 212.40

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Solution

The fourth proportional to 213.60, 318.03 and 212.40 is: 316.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.60 : 318.03 = 212.40 : x
  2. Step 2: Convert to fraction form
    213.60/318.03 = 212.40/x
  3. Step 3: Cross multiply
    213.60x = 318.03 × 212.40
  4. Step 4: Simplify right side
    213.60x = 67,549.57
  5. Step 5: Solve for x
    x = 67,549.57/213.60
  6. Step 6: Final answer
    x = 316.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.