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Finding the Fourth Proportional to 1,332.64, 1,997.56 and 811.36

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Solution

The fourth proportional to 1,332.64, 1,997.56 and 811.36 is: 1,216.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.64 : 1,997.56 = 811.36 : x
  2. Step 2: Convert to fraction form
    1,332.64/1,997.56 = 811.36/x
  3. Step 3: Cross multiply
    1,332.64x = 1,997.56 × 811.36
  4. Step 4: Simplify right side
    1,332.64x = 1,620,740.28
  5. Step 5: Solve for x
    x = 1,620,740.28/1,332.64
  6. Step 6: Final answer
    x = 1,216.19

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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.