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Finding the Fourth Proportional to 228.60, 316.44 and 209.16

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Solution

The fourth proportional to 228.60, 316.44 and 209.16 is: 289.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.60 : 316.44 = 209.16 : x
  2. Step 2: Convert to fraction form
    228.60/316.44 = 209.16/x
  3. Step 3: Cross multiply
    228.60x = 316.44 × 209.16
  4. Step 4: Simplify right side
    228.60x = 66,186.59
  5. Step 5: Solve for x
    x = 66,186.59/228.60
  6. Step 6: Final answer
    x = 289.53

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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.