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Finding the Fourth Proportional to 641.99, 885.95 and 347.25

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Solution

The fourth proportional to 641.99, 885.95 and 347.25 is: 479.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.99 : 885.95 = 347.25 : x
  2. Step 2: Convert to fraction form
    641.99/885.95 = 347.25/x
  3. Step 3: Cross multiply
    641.99x = 885.95 × 347.25
  4. Step 4: Simplify right side
    641.99x = 307,648.05
  5. Step 5: Solve for x
    x = 307,648.05/641.99
  6. Step 6: Final answer
    x = 479.21

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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.