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Finding the Fourth Proportional to 346.96, 520.90 and 318.31

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Solution

The fourth proportional to 346.96, 520.90 and 318.31 is: 477.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.96 : 520.90 = 318.31 : x
  2. Step 2: Convert to fraction form
    346.96/520.90 = 318.31/x
  3. Step 3: Cross multiply
    346.96x = 520.90 × 318.31
  4. Step 4: Simplify right side
    346.96x = 165,804.93
  5. Step 5: Solve for x
    x = 165,804.93/346.96
  6. Step 6: Final answer
    x = 477.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.