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Finding the Fourth Proportional to 639.35, 883.40 and 493.24

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Solution

The fourth proportional to 639.35, 883.40 and 493.24 is: 681.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.35 : 883.40 = 493.24 : x
  2. Step 2: Convert to fraction form
    639.35/883.40 = 493.24/x
  3. Step 3: Cross multiply
    639.35x = 883.40 × 493.24
  4. Step 4: Simplify right side
    639.35x = 435,728.22
  5. Step 5: Solve for x
    x = 435,728.22/639.35
  6. Step 6: Final answer
    x = 681.52

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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.