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Finding the Fourth Proportional to 913.41, 1,369.17 and 639.41

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Solution

The fourth proportional to 913.41, 1,369.17 and 639.41 is: 958.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.41 : 1,369.17 = 639.41 : x
  2. Step 2: Convert to fraction form
    913.41/1,369.17 = 639.41/x
  3. Step 3: Cross multiply
    913.41x = 1,369.17 × 639.41
  4. Step 4: Simplify right side
    913.41x = 875,454.14
  5. Step 5: Solve for x
    x = 875,454.14/913.41
  6. Step 6: Final answer
    x = 958.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.