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Finding the Fourth Proportional to 934.41, 1,288.53 and 639.21

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Solution

The fourth proportional to 934.41, 1,288.53 and 639.21 is: 881.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.41 : 1,288.53 = 639.21 : x
  2. Step 2: Convert to fraction form
    934.41/1,288.53 = 639.21/x
  3. Step 3: Cross multiply
    934.41x = 1,288.53 × 639.21
  4. Step 4: Simplify right side
    934.41x = 823,641.26
  5. Step 5: Solve for x
    x = 823,641.26/934.41
  6. Step 6: Final answer
    x = 881.46

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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.