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Finding the Fourth Proportional to 345.25, 476.85 and 228.61

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Solution

The fourth proportional to 345.25, 476.85 and 228.61 is: 315.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.25 : 476.85 = 228.61 : x
  2. Step 2: Convert to fraction form
    345.25/476.85 = 228.61/x
  3. Step 3: Cross multiply
    345.25x = 476.85 × 228.61
  4. Step 4: Simplify right side
    345.25x = 109,012.68
  5. Step 5: Solve for x
    x = 109,012.68/345.25
  6. Step 6: Final answer
    x = 315.75

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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.