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Finding the Fourth Proportional to 805.17, 1,110.46 and 639.12

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Solution

The fourth proportional to 805.17, 1,110.46 and 639.12 is: 881.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    805.17 : 1,110.46 = 639.12 : x
  2. Step 2: Convert to fraction form
    805.17/1,110.46 = 639.12/x
  3. Step 3: Cross multiply
    805.17x = 1,110.46 × 639.12
  4. Step 4: Simplify right side
    805.17x = 709,717.20
  5. Step 5: Solve for x
    x = 709,717.20/805.17
  6. Step 6: Final answer
    x = 881.45

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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.