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Finding the Fourth Proportional to 639.63, 952.18 and 609.81

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Solution

The fourth proportional to 639.63, 952.18 and 609.81 is: 907.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.63 : 952.18 = 609.81 : x
  2. Step 2: Convert to fraction form
    639.63/952.18 = 609.81/x
  3. Step 3: Cross multiply
    639.63x = 952.18 × 609.81
  4. Step 4: Simplify right side
    639.63x = 580,647.36
  5. Step 5: Solve for x
    x = 580,647.36/639.63
  6. Step 6: Final answer
    x = 907.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.