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Finding the Fourth Proportional to 228.77, 315.86 and 155.15

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Solution

The fourth proportional to 228.77, 315.86 and 155.15 is: 214.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.77 : 315.86 = 155.15 : x
  2. Step 2: Convert to fraction form
    228.77/315.86 = 155.15/x
  3. Step 3: Cross multiply
    228.77x = 315.86 × 155.15
  4. Step 4: Simplify right side
    228.77x = 49,003.32
  5. Step 5: Solve for x
    x = 49,003.32/228.77
  6. Step 6: Final answer
    x = 214.21

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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.