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Finding the Fourth Proportional to 642.21, 886.59 and 494.52

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Solution

The fourth proportional to 642.21, 886.59 and 494.52 is: 682.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.21 : 886.59 = 494.52 : x
  2. Step 2: Convert to fraction form
    642.21/886.59 = 494.52/x
  3. Step 3: Cross multiply
    642.21x = 886.59 × 494.52
  4. Step 4: Simplify right side
    642.21x = 438,436.49
  5. Step 5: Solve for x
    x = 438,436.49/642.21
  6. Step 6: Final answer
    x = 682.70

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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.