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Finding the Fourth Proportional to 626.99, 865.21 and 347.20

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Solution

The fourth proportional to 626.99, 865.21 and 347.20 is: 479.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.99 : 865.21 = 347.20 : x
  2. Step 2: Convert to fraction form
    626.99/865.21 = 347.20/x
  3. Step 3: Cross multiply
    626.99x = 865.21 × 347.20
  4. Step 4: Simplify right side
    626.99x = 300,400.91
  5. Step 5: Solve for x
    x = 300,400.91/626.99
  6. Step 6: Final answer
    x = 479.12

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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.