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Finding the Fourth Proportional to 228.79, 343.19 and 66.47

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Solution

The fourth proportional to 228.79, 343.19 and 66.47 is: 99.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.79 : 343.19 = 66.47 : x
  2. Step 2: Convert to fraction form
    228.79/343.19 = 66.47/x
  3. Step 3: Cross multiply
    228.79x = 343.19 × 66.47
  4. Step 4: Simplify right side
    228.79x = 22,811.51
  5. Step 5: Solve for x
    x = 22,811.51/228.79
  6. Step 6: Final answer
    x = 99.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.