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Finding the Fourth Proportional to 934.28, 1,288.56 and 639.08

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Solution

The fourth proportional to 934.28, 1,288.56 and 639.08 is: 881.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    934.28 : 1,288.56 = 639.08 : x
  2. Step 2: Convert to fraction form
    934.28/1,288.56 = 639.08/x
  3. Step 3: Cross multiply
    934.28x = 1,288.56 × 639.08
  4. Step 4: Simplify right side
    934.28x = 823,492.92
  5. Step 5: Solve for x
    x = 823,492.92/934.28
  6. Step 6: Final answer
    x = 881.42

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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.