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Finding the Fourth Proportional to 639.96, 883.26 and 501.72

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Solution

The fourth proportional to 639.96, 883.26 and 501.72 is: 692.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.96 : 883.26 = 501.72 : x
  2. Step 2: Convert to fraction form
    639.96/883.26 = 501.72/x
  3. Step 3: Cross multiply
    639.96x = 883.26 × 501.72
  4. Step 4: Simplify right side
    639.96x = 443,149.21
  5. Step 5: Solve for x
    x = 443,149.21/639.96
  6. Step 6: Final answer
    x = 692.46

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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.