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Finding the Fourth Proportional to 641.28, 888.69 and 631.56

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Solution

The fourth proportional to 641.28, 888.69 and 631.56 is: 875.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.28 : 888.69 = 631.56 : x
  2. Step 2: Convert to fraction form
    641.28/888.69 = 631.56/x
  3. Step 3: Cross multiply
    641.28x = 888.69 × 631.56
  4. Step 4: Simplify right side
    641.28x = 561,261.06
  5. Step 5: Solve for x
    x = 561,261.06/641.28
  6. Step 6: Final answer
    x = 875.22

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.