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Finding the Fourth Proportional to 346.69, 478.18 and 331.17

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Solution

The fourth proportional to 346.69, 478.18 and 331.17 is: 456.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.69 : 478.18 = 331.17 : x
  2. Step 2: Convert to fraction form
    346.69/478.18 = 331.17/x
  3. Step 3: Cross multiply
    346.69x = 478.18 × 331.17
  4. Step 4: Simplify right side
    346.69x = 158,358.87
  5. Step 5: Solve for x
    x = 158,358.87/346.69
  6. Step 6: Final answer
    x = 456.77

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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.