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Finding the Fourth Proportional to 345.95, 477.04 and 221.61

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Solution

The fourth proportional to 345.95, 477.04 and 221.61 is: 305.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.95 : 477.04 = 221.61 : x
  2. Step 2: Convert to fraction form
    345.95/477.04 = 221.61/x
  3. Step 3: Cross multiply
    345.95x = 477.04 × 221.61
  4. Step 4: Simplify right side
    345.95x = 105,718.30
  5. Step 5: Solve for x
    x = 105,718.30/345.95
  6. Step 6: Final answer
    x = 305.59

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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.