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Finding the Fourth Proportional to 345.80, 477.48 and 221.68

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Solution

The fourth proportional to 345.80, 477.48 and 221.68 is: 306.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.80 : 477.48 = 221.68 : x
  2. Step 2: Convert to fraction form
    345.80/477.48 = 221.68/x
  3. Step 3: Cross multiply
    345.80x = 477.48 × 221.68
  4. Step 4: Simplify right side
    345.80x = 105,847.77
  5. Step 5: Solve for x
    x = 105,847.77/345.80
  6. Step 6: Final answer
    x = 306.10

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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.