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Finding the Fourth Proportional to 215, 322.50 and 86.84

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Solution

The fourth proportional to 215, 322.50 and 86.84 is: 130.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    215 : 322.50 = 86.84 : x
  2. Step 2: Convert to fraction form
    215/322.50 = 86.84/x
  3. Step 3: Cross multiply
    215x = 322.50 × 86.84
  4. Step 4: Simplify right side
    215x = 28,005.90
  5. Step 5: Solve for x
    x = 28,005.90/215
  6. Step 6: Final answer
    x = 130.26

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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.