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Finding the Fourth Proportional to 639.45, 881.64 and 534.69

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Solution

The fourth proportional to 639.45, 881.64 and 534.69 is: 737.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.45 : 881.64 = 534.69 : x
  2. Step 2: Convert to fraction form
    639.45/881.64 = 534.69/x
  3. Step 3: Cross multiply
    639.45x = 881.64 × 534.69
  4. Step 4: Simplify right side
    639.45x = 471,404.09
  5. Step 5: Solve for x
    x = 471,404.09/639.45
  6. Step 6: Final answer
    x = 737.20

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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.