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Finding the Fourth Proportional to 1,330.60, 1,995.90 and 813.92

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Solution

The fourth proportional to 1,330.60, 1,995.90 and 813.92 is: 1,220.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.60 : 1,995.90 = 813.92 : x
  2. Step 2: Convert to fraction form
    1,330.60/1,995.90 = 813.92/x
  3. Step 3: Cross multiply
    1,330.60x = 1,995.90 × 813.92
  4. Step 4: Simplify right side
    1,330.60x = 1,624,502.93
  5. Step 5: Solve for x
    x = 1,624,502.93/1,330.60
  6. Step 6: Final answer
    x = 1,220.88

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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.