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Finding the Fourth Proportional to 228.78, 315.72 and 130.54

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Solution

The fourth proportional to 228.78, 315.72 and 130.54 is: 180.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.78 : 315.72 = 130.54 : x
  2. Step 2: Convert to fraction form
    228.78/315.72 = 130.54/x
  3. Step 3: Cross multiply
    228.78x = 315.72 × 130.54
  4. Step 4: Simplify right side
    228.78x = 41,212.35
  5. Step 5: Solve for x
    x = 41,212.35/228.78
  6. Step 6: Final answer
    x = 180.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.