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Finding the Fourth Proportional to 228.18, 342.03 and 91.17

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Solution

The fourth proportional to 228.18, 342.03 and 91.17 is: 136.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.18 : 342.03 = 91.17 : x
  2. Step 2: Convert to fraction form
    228.18/342.03 = 91.17/x
  3. Step 3: Cross multiply
    228.18x = 342.03 × 91.17
  4. Step 4: Simplify right side
    228.18x = 31,182.88
  5. Step 5: Solve for x
    x = 31,182.88/228.18
  6. Step 6: Final answer
    x = 136.66

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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.