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Finding the Fourth Proportional to 1,330.68, 1,995.39 and 406.05

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Solution

The fourth proportional to 1,330.68, 1,995.39 and 406.05 is: 608.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.68 : 1,995.39 = 406.05 : x
  2. Step 2: Convert to fraction form
    1,330.68/1,995.39 = 406.05/x
  3. Step 3: Cross multiply
    1,330.68x = 1,995.39 × 406.05
  4. Step 4: Simplify right side
    1,330.68x = 810,228.11
  5. Step 5: Solve for x
    x = 810,228.11/1,330.68
  6. Step 6: Final answer
    x = 608.88

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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.