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Finding the Fourth Proportional to 346.16, 477.72 and 221.76

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Solution

The fourth proportional to 346.16, 477.72 and 221.76 is: 306.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.16 : 477.72 = 221.76 : x
  2. Step 2: Convert to fraction form
    346.16/477.72 = 221.76/x
  3. Step 3: Cross multiply
    346.16x = 477.72 × 221.76
  4. Step 4: Simplify right side
    346.16x = 105,939.19
  5. Step 5: Solve for x
    x = 105,939.19/346.16
  6. Step 6: Final answer
    x = 306.04

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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.