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Finding the Fourth Proportional to 634.98, 876.18 and 355.21

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Solution

The fourth proportional to 634.98, 876.18 and 355.21 is: 490.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.98 : 876.18 = 355.21 : x
  2. Step 2: Convert to fraction form
    634.98/876.18 = 355.21/x
  3. Step 3: Cross multiply
    634.98x = 876.18 × 355.21
  4. Step 4: Simplify right side
    634.98x = 311,225.71
  5. Step 5: Solve for x
    x = 311,225.71/634.98
  6. Step 6: Final answer
    x = 490.13

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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.