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Finding the Fourth Proportional to 347.31, 520.95 and 286.19

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Solution

The fourth proportional to 347.31, 520.95 and 286.19 is: 429.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.31 : 520.95 = 286.19 : x
  2. Step 2: Convert to fraction form
    347.31/520.95 = 286.19/x
  3. Step 3: Cross multiply
    347.31x = 520.95 × 286.19
  4. Step 4: Simplify right side
    347.31x = 149,090.68
  5. Step 5: Solve for x
    x = 149,090.68/347.31
  6. Step 6: Final answer
    x = 429.27

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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.