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Finding the Fourth Proportional to 228.63, 315.18 and 215.25

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Solution

The fourth proportional to 228.63, 315.18 and 215.25 is: 296.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.63 : 315.18 = 215.25 : x
  2. Step 2: Convert to fraction form
    228.63/315.18 = 215.25/x
  3. Step 3: Cross multiply
    228.63x = 315.18 × 215.25
  4. Step 4: Simplify right side
    228.63x = 67,842.50
  5. Step 5: Solve for x
    x = 67,842.50/228.63
  6. Step 6: Final answer
    x = 296.73

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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.