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Finding the Fourth Proportional to 639.95, 883.56 and 453.63

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Solution

The fourth proportional to 639.95, 883.56 and 453.63 is: 626.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.95 : 883.56 = 453.63 : x
  2. Step 2: Convert to fraction form
    639.95/883.56 = 453.63/x
  3. Step 3: Cross multiply
    639.95x = 883.56 × 453.63
  4. Step 4: Simplify right side
    639.95x = 400,809.20
  5. Step 5: Solve for x
    x = 400,809.20/639.95
  6. Step 6: Final answer
    x = 626.31

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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.