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Finding the Fourth Proportional to 178.95, 268.08 and 86.22

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Solution

The fourth proportional to 178.95, 268.08 and 86.22 is: 129.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    178.95 : 268.08 = 86.22 : x
  2. Step 2: Convert to fraction form
    178.95/268.08 = 86.22/x
  3. Step 3: Cross multiply
    178.95x = 268.08 × 86.22
  4. Step 4: Simplify right side
    178.95x = 23,113.86
  5. Step 5: Solve for x
    x = 23,113.86/178.95
  6. Step 6: Final answer
    x = 129.16

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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.