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Finding the Fourth Proportional to 639.45, 882.96 and 403.77

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Solution

The fourth proportional to 639.45, 882.96 and 403.77 is: 557.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.45 : 882.96 = 403.77 : x
  2. Step 2: Convert to fraction form
    639.45/882.96 = 403.77/x
  3. Step 3: Cross multiply
    639.45x = 882.96 × 403.77
  4. Step 4: Simplify right side
    639.45x = 356,512.76
  5. Step 5: Solve for x
    x = 356,512.76/639.45
  6. Step 6: Final answer
    x = 557.53

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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.