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Finding the Fourth Proportional to 642, 885.72 and 445.92

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Solution

The fourth proportional to 642, 885.72 and 445.92 is: 615.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642 : 885.72 = 445.92 : x
  2. Step 2: Convert to fraction form
    642/885.72 = 445.92/x
  3. Step 3: Cross multiply
    642x = 885.72 × 445.92
  4. Step 4: Simplify right side
    642x = 394,960.26
  5. Step 5: Solve for x
    x = 394,960.26/642
  6. Step 6: Final answer
    x = 615.20

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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.