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Finding the Fourth Proportional to 215.52, 298.60 and 210.90

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Solution

The fourth proportional to 215.52, 298.60 and 210.90 is: 292.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.52 : 298.60 = 210.90 : x
  2. Step 2: Convert to fraction form
    215.52/298.60 = 210.90/x
  3. Step 3: Cross multiply
    215.52x = 298.60 × 210.90
  4. Step 4: Simplify right side
    215.52x = 62,976.52
  5. Step 5: Solve for x
    x = 62,976.52/215.52
  6. Step 6: Final answer
    x = 292.21

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.