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Finding the Fourth Proportional to 215.06, 321.30 and 210.20

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Solution

The fourth proportional to 215.06, 321.30 and 210.20 is: 314.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.06 : 321.30 = 210.20 : x
  2. Step 2: Convert to fraction form
    215.06/321.30 = 210.20/x
  3. Step 3: Cross multiply
    215.06x = 321.30 × 210.20
  4. Step 4: Simplify right side
    215.06x = 67,535.65
  5. Step 5: Solve for x
    x = 67,535.65/215.06
  6. Step 6: Final answer
    x = 314.04

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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.