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Finding the Fourth Proportional to 1,332.94, 1,996.34 and 640.08

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Solution

The fourth proportional to 1,332.94, 1,996.34 and 640.08 is: 958.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.94 : 1,996.34 = 640.08 : x
  2. Step 2: Convert to fraction form
    1,332.94/1,996.34 = 640.08/x
  3. Step 3: Cross multiply
    1,332.94x = 1,996.34 × 640.08
  4. Step 4: Simplify right side
    1,332.94x = 1,277,817.31
  5. Step 5: Solve for x
    x = 1,277,817.31/1,332.94
  6. Step 6: Final answer
    x = 958.65

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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.