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Finding the Fourth Proportional to 346.52, 478.20 and 189.15

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Solution

The fourth proportional to 346.52, 478.20 and 189.15 is: 261.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.52 : 478.20 = 189.15 : x
  2. Step 2: Convert to fraction form
    346.52/478.20 = 189.15/x
  3. Step 3: Cross multiply
    346.52x = 478.20 × 189.15
  4. Step 4: Simplify right side
    346.52x = 90,451.18
  5. Step 5: Solve for x
    x = 90,451.18/346.52
  6. Step 6: Final answer
    x = 261.03

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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.