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Finding the Fourth Proportional to 215.09, 322.85 and 210.09

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Solution

The fourth proportional to 215.09, 322.85 and 210.09 is: 315.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.09 : 322.85 = 210.09 : x
  2. Step 2: Convert to fraction form
    215.09/322.85 = 210.09/x
  3. Step 3: Cross multiply
    215.09x = 322.85 × 210.09
  4. Step 4: Simplify right side
    215.09x = 67,829.29
  5. Step 5: Solve for x
    x = 67,829.29/215.09
  6. Step 6: Final answer
    x = 315.35

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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.