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Finding the Fourth Proportional to 346.78, 478.59 and 199.43

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Solution

The fourth proportional to 346.78, 478.59 and 199.43 is: 275.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.78 : 478.59 = 199.43 : x
  2. Step 2: Convert to fraction form
    346.78/478.59 = 199.43/x
  3. Step 3: Cross multiply
    346.78x = 478.59 × 199.43
  4. Step 4: Simplify right side
    346.78x = 95,444.98
  5. Step 5: Solve for x
    x = 95,444.98/346.78
  6. Step 6: Final answer
    x = 275.23

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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.