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Finding the Fourth Proportional to 228.80, 343.16 and 66.45

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Solution

The fourth proportional to 228.80, 343.16 and 66.45 is: 99.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.80 : 343.16 = 66.45 : x
  2. Step 2: Convert to fraction form
    228.80/343.16 = 66.45/x
  3. Step 3: Cross multiply
    228.80x = 343.16 × 66.45
  4. Step 4: Simplify right side
    228.80x = 22,801.48
  5. Step 5: Solve for x
    x = 22,801.48/228.80
  6. Step 6: Final answer
    x = 99.66

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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.