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Finding the Fourth Proportional to 1,326.30, 1,989.21 and 448.71

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Solution

The fourth proportional to 1,326.30, 1,989.21 and 448.71 is: 672.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.30 : 1,989.21 = 448.71 : x
  2. Step 2: Convert to fraction form
    1,326.30/1,989.21 = 448.71/x
  3. Step 3: Cross multiply
    1,326.30x = 1,989.21 × 448.71
  4. Step 4: Simplify right side
    1,326.30x = 892,578.42
  5. Step 5: Solve for x
    x = 892,578.42/1,326.30
  6. Step 6: Final answer
    x = 672.98

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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.