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Finding the Fourth Proportional to 346.51, 478.21 and 199.17

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Solution

The fourth proportional to 346.51, 478.21 and 199.17 is: 274.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.51 : 478.21 = 199.17 : x
  2. Step 2: Convert to fraction form
    346.51/478.21 = 199.17/x
  3. Step 3: Cross multiply
    346.51x = 478.21 × 199.17
  4. Step 4: Simplify right side
    346.51x = 95,244.09
  5. Step 5: Solve for x
    x = 95,244.09/346.51
  6. Step 6: Final answer
    x = 274.87

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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.