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Finding the Fourth Proportional to 639.36, 883.05 and 429.18

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Solution

The fourth proportional to 639.36, 883.05 and 429.18 is: 592.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.36 : 883.05 = 429.18 : x
  2. Step 2: Convert to fraction form
    639.36/883.05 = 429.18/x
  3. Step 3: Cross multiply
    639.36x = 883.05 × 429.18
  4. Step 4: Simplify right side
    639.36x = 378,987.40
  5. Step 5: Solve for x
    x = 378,987.40/639.36
  6. Step 6: Final answer
    x = 592.76

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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.