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Finding the Fourth Proportional to 913.32, 1,367.92 and 640.63

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Solution

The fourth proportional to 913.32, 1,367.92 and 640.63 is: 959.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.32 : 1,367.92 = 640.63 : x
  2. Step 2: Convert to fraction form
    913.32/1,367.92 = 640.63/x
  3. Step 3: Cross multiply
    913.32x = 1,367.92 × 640.63
  4. Step 4: Simplify right side
    913.32x = 876,333.10
  5. Step 5: Solve for x
    x = 876,333.10/913.32
  6. Step 6: Final answer
    x = 959.50

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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.