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Finding the Fourth Proportional to 639.61, 881.72 and 452.52

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Solution

The fourth proportional to 639.61, 881.72 and 452.52 is: 623.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.61 : 881.72 = 452.52 : x
  2. Step 2: Convert to fraction form
    639.61/881.72 = 452.52/x
  3. Step 3: Cross multiply
    639.61x = 881.72 × 452.52
  4. Step 4: Simplify right side
    639.61x = 398,995.37
  5. Step 5: Solve for x
    x = 398,995.37/639.61
  6. Step 6: Final answer
    x = 623.81

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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.