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Finding the Fourth Proportional to 639.90, 881.28 and 592.92

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Solution

The fourth proportional to 639.90, 881.28 and 592.92 is: 816.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.90 : 881.28 = 592.92 : x
  2. Step 2: Convert to fraction form
    639.90/881.28 = 592.92/x
  3. Step 3: Cross multiply
    639.90x = 881.28 × 592.92
  4. Step 4: Simplify right side
    639.90x = 522,528.54
  5. Step 5: Solve for x
    x = 522,528.54/639.90
  6. Step 6: Final answer
    x = 816.58

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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.