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Finding the Fourth Proportional to 228.14, 342.35 and 91.16

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Solution

The fourth proportional to 228.14, 342.35 and 91.16 is: 136.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.14 : 342.35 = 91.16 : x
  2. Step 2: Convert to fraction form
    228.14/342.35 = 91.16/x
  3. Step 3: Cross multiply
    228.14x = 342.35 × 91.16
  4. Step 4: Simplify right side
    228.14x = 31,209.21
  5. Step 5: Solve for x
    x = 31,209.21/228.14
  6. Step 6: Final answer
    x = 136.80

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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.