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Finding the Fourth Proportional to 634.80, 876.24 and 445.80

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Solution

The fourth proportional to 634.80, 876.24 and 445.80 is: 615.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.80 : 876.24 = 445.80 : x
  2. Step 2: Convert to fraction form
    634.80/876.24 = 445.80/x
  3. Step 3: Cross multiply
    634.80x = 876.24 × 445.80
  4. Step 4: Simplify right side
    634.80x = 390,627.79
  5. Step 5: Solve for x
    x = 390,627.79/634.80
  6. Step 6: Final answer
    x = 615.36

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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.