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Finding the Fourth Proportional to 1,326.38, 1,990.12 and 460.76

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Solution

The fourth proportional to 1,326.38, 1,990.12 and 460.76 is: 691.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.38 : 1,990.12 = 460.76 : x
  2. Step 2: Convert to fraction form
    1,326.38/1,990.12 = 460.76/x
  3. Step 3: Cross multiply
    1,326.38x = 1,990.12 × 460.76
  4. Step 4: Simplify right side
    1,326.38x = 916,967.69
  5. Step 5: Solve for x
    x = 916,967.69/1,326.38
  6. Step 6: Final answer
    x = 691.33

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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.