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Finding the Fourth Proportional to 1,330.97, 1,996.64 and 406.40

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Solution

The fourth proportional to 1,330.97, 1,996.64 and 406.40 is: 609.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.97 : 1,996.64 = 406.40 : x
  2. Step 2: Convert to fraction form
    1,330.97/1,996.64 = 406.40/x
  3. Step 3: Cross multiply
    1,330.97x = 1,996.64 × 406.40
  4. Step 4: Simplify right side
    1,330.97x = 811,440.02
  5. Step 5: Solve for x
    x = 811,440.02/1,330.97
  6. Step 6: Final answer
    x = 609.66

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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.