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Finding the Fourth Proportional to 228.49, 342.55 and 91.47

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Solution

The fourth proportional to 228.49, 342.55 and 91.47 is: 137.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.49 : 342.55 = 91.47 : x
  2. Step 2: Convert to fraction form
    228.49/342.55 = 91.47/x
  3. Step 3: Cross multiply
    228.49x = 342.55 × 91.47
  4. Step 4: Simplify right side
    228.49x = 31,333.05
  5. Step 5: Solve for x
    x = 31,333.05/228.49
  6. Step 6: Final answer
    x = 137.13

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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.