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Finding the Fourth Proportional to 354.16, 488.54 and 221.47

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Solution

The fourth proportional to 354.16, 488.54 and 221.47 is: 305.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.16 : 488.54 = 221.47 : x
  2. Step 2: Convert to fraction form
    354.16/488.54 = 221.47/x
  3. Step 3: Cross multiply
    354.16x = 488.54 × 221.47
  4. Step 4: Simplify right side
    354.16x = 108,195.46
  5. Step 5: Solve for x
    x = 108,195.46/354.16
  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.