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Finding the Fourth Proportional to 346.79, 478.56 and 189.41

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Solution

The fourth proportional to 346.79, 478.56 and 189.41 is: 261.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.79 : 478.56 = 189.41 : x
  2. Step 2: Convert to fraction form
    346.79/478.56 = 189.41/x
  3. Step 3: Cross multiply
    346.79x = 478.56 × 189.41
  4. Step 4: Simplify right side
    346.79x = 90,645.37
  5. Step 5: Solve for x
    x = 90,645.37/346.79
  6. Step 6: Final answer
    x = 261.39

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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.