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Finding the Fourth Proportional to 228.36, 316.72 and 220.58

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Solution

The fourth proportional to 228.36, 316.72 and 220.58 is: 305.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.36 : 316.72 = 220.58 : x
  2. Step 2: Convert to fraction form
    228.36/316.72 = 220.58/x
  3. Step 3: Cross multiply
    228.36x = 316.72 × 220.58
  4. Step 4: Simplify right side
    228.36x = 69,862.10
  5. Step 5: Solve for x
    x = 69,862.10/228.36
  6. Step 6: Final answer
    x = 305.93

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.