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Finding the Fourth Proportional to 639.92, 955.04 and 623.52

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Solution

The fourth proportional to 639.92, 955.04 and 623.52 is: 930.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.92 : 955.04 = 623.52 : x
  2. Step 2: Convert to fraction form
    639.92/955.04 = 623.52/x
  3. Step 3: Cross multiply
    639.92x = 955.04 × 623.52
  4. Step 4: Simplify right side
    639.92x = 595,486.54
  5. Step 5: Solve for x
    x = 595,486.54/639.92
  6. Step 6: Final answer
    x = 930.56

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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.