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Finding the Fourth Proportional to 228.68, 315.70 and 155.38

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Solution

The fourth proportional to 228.68, 315.70 and 155.38 is: 214.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.68 : 315.70 = 155.38 : x
  2. Step 2: Convert to fraction form
    228.68/315.70 = 155.38/x
  3. Step 3: Cross multiply
    228.68x = 315.70 × 155.38
  4. Step 4: Simplify right side
    228.68x = 49,053.47
  5. Step 5: Solve for x
    x = 49,053.47/228.68
  6. Step 6: Final answer
    x = 214.51

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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.