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Finding the Fourth Proportional to 213.83, 318.75 and 211.40

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Solution

The fourth proportional to 213.83, 318.75 and 211.40 is: 315.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.83 : 318.75 = 211.40 : x
  2. Step 2: Convert to fraction form
    213.83/318.75 = 211.40/x
  3. Step 3: Cross multiply
    213.83x = 318.75 × 211.40
  4. Step 4: Simplify right side
    213.83x = 67,382.16
  5. Step 5: Solve for x
    x = 67,382.16/213.83
  6. Step 6: Final answer
    x = 315.13

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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.