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Finding the Fourth Proportional to 639.86, 884.37 and 564.02

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Solution

The fourth proportional to 639.86, 884.37 and 564.02 is: 779.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.86 : 884.37 = 564.02 : x
  2. Step 2: Convert to fraction form
    639.86/884.37 = 564.02/x
  3. Step 3: Cross multiply
    639.86x = 884.37 × 564.02
  4. Step 4: Simplify right side
    639.86x = 498,802.37
  5. Step 5: Solve for x
    x = 498,802.37/639.86
  6. Step 6: Final answer
    x = 779.55

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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.