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Finding the Fourth Proportional to 1,326.70, 1,988.41 and 460

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Solution

The fourth proportional to 1,326.70, 1,988.41 and 460 is: 689.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.70 : 1,988.41 = 460 : x
  2. Step 2: Convert to fraction form
    1,326.70/1,988.41 = 460/x
  3. Step 3: Cross multiply
    1,326.70x = 1,988.41 × 460
  4. Step 4: Simplify right side
    1,326.70x = 914,668.60
  5. Step 5: Solve for x
    x = 914,668.60/1,326.70
  6. Step 6: Final answer
    x = 689.43

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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.