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Finding the Fourth Proportional to 639.49, 881.98 and 552.01

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Solution

The fourth proportional to 639.49, 881.98 and 552.01 is: 761.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.49 : 881.98 = 552.01 : x
  2. Step 2: Convert to fraction form
    639.49/881.98 = 552.01/x
  3. Step 3: Cross multiply
    639.49x = 881.98 × 552.01
  4. Step 4: Simplify right side
    639.49x = 486,863.98
  5. Step 5: Solve for x
    x = 486,863.98/639.49
  6. Step 6: Final answer
    x = 761.33

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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.