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Finding the Fourth Proportional to 1,332.80, 1,998.33 and 639.45

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Solution

The fourth proportional to 1,332.80, 1,998.33 and 639.45 is: 958.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.80 : 1,998.33 = 639.45 : x
  2. Step 2: Convert to fraction form
    1,332.80/1,998.33 = 639.45/x
  3. Step 3: Cross multiply
    1,332.80x = 1,998.33 × 639.45
  4. Step 4: Simplify right side
    1,332.80x = 1,277,832.12
  5. Step 5: Solve for x
    x = 1,277,832.12/1,332.80
  6. Step 6: Final answer
    x = 958.76

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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.