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Finding the Fourth Proportional to 639.76, 883.38 and 590.62

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Solution

The fourth proportional to 639.76, 883.38 and 590.62 is: 815.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.76 : 883.38 = 590.62 : x
  2. Step 2: Convert to fraction form
    639.76/883.38 = 590.62/x
  3. Step 3: Cross multiply
    639.76x = 883.38 × 590.62
  4. Step 4: Simplify right side
    639.76x = 521,741.90
  5. Step 5: Solve for x
    x = 521,741.90/639.76
  6. Step 6: Final answer
    x = 815.53

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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.