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Finding the Fourth Proportional to 346.45, 478.11 and 213.72

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Solution

The fourth proportional to 346.45, 478.11 and 213.72 is: 294.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.45 : 478.11 = 213.72 : x
  2. Step 2: Convert to fraction form
    346.45/478.11 = 213.72/x
  3. Step 3: Cross multiply
    346.45x = 478.11 × 213.72
  4. Step 4: Simplify right side
    346.45x = 102,181.67
  5. Step 5: Solve for x
    x = 102,181.67/346.45
  6. Step 6: Final answer
    x = 294.94

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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.