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Finding the Fourth Proportional to 228.72, 315.72 and 155.10

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Solution

The fourth proportional to 228.72, 315.72 and 155.10 is: 214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.72 : 315.72 = 155.10 : x
  2. Step 2: Convert to fraction form
    228.72/315.72 = 155.10/x
  3. Step 3: Cross multiply
    228.72x = 315.72 × 155.10
  4. Step 4: Simplify right side
    228.72x = 48,968.17
  5. Step 5: Solve for x
    x = 48,968.17/228.72
  6. Step 6: Final answer
    x = 214.10

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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.