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Finding the Fourth Proportional to 345.89, 476.96 and 221.55

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Solution

The fourth proportional to 345.89, 476.96 and 221.55 is: 305.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.89 : 476.96 = 221.55 : x
  2. Step 2: Convert to fraction form
    345.89/476.96 = 221.55/x
  3. Step 3: Cross multiply
    345.89x = 476.96 × 221.55
  4. Step 4: Simplify right side
    345.89x = 105,669.38
  5. Step 5: Solve for x
    x = 105,669.38/345.89
  6. Step 6: Final answer
    x = 305.50

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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.