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Finding the Fourth Proportional to 215.34, 322.89 and 86.94

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Solution

The fourth proportional to 215.34, 322.89 and 86.94 is: 130.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.34 : 322.89 = 86.94 : x
  2. Step 2: Convert to fraction form
    215.34/322.89 = 86.94/x
  3. Step 3: Cross multiply
    215.34x = 322.89 × 86.94
  4. Step 4: Simplify right side
    215.34x = 28,072.06
  5. Step 5: Solve for x
    x = 28,072.06/215.34
  6. Step 6: Final answer
    x = 130.36

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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.