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Finding the Fourth Proportional to 347.99, 520.43 and 286.63

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Solution

The fourth proportional to 347.99, 520.43 and 286.63 is: 428.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    347.99 : 520.43 = 286.63 : x
  2. Step 2: Convert to fraction form
    347.99/520.43 = 286.63/x
  3. Step 3: Cross multiply
    347.99x = 520.43 × 286.63
  4. Step 4: Simplify right side
    347.99x = 149,168.12
  5. Step 5: Solve for x
    x = 149,168.12/347.99
  6. Step 6: Final answer
    x = 428.66

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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.