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Finding the Fourth Proportional to 1,422.21, 2,132.82 and 448.32

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Solution

The fourth proportional to 1,422.21, 2,132.82 and 448.32 is: 672.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.21 : 2,132.82 = 448.32 : x
  2. Step 2: Convert to fraction form
    1,422.21/2,132.82 = 448.32/x
  3. Step 3: Cross multiply
    1,422.21x = 2,132.82 × 448.32
  4. Step 4: Simplify right side
    1,422.21x = 956,185.86
  5. Step 5: Solve for x
    x = 956,185.86/1,422.21
  6. Step 6: Final answer
    x = 672.32

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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.