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Finding the Fourth Proportional to 1,326.66, 1,990.90 and 460.97

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Solution

The fourth proportional to 1,326.66, 1,990.90 and 460.97 is: 691.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.66 : 1,990.90 = 460.97 : x
  2. Step 2: Convert to fraction form
    1,326.66/1,990.90 = 460.97/x
  3. Step 3: Cross multiply
    1,326.66x = 1,990.90 × 460.97
  4. Step 4: Simplify right side
    1,326.66x = 917,749.00
  5. Step 5: Solve for x
    x = 917,749.00/1,326.66
  6. Step 6: Final answer
    x = 691.77

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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.