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Finding the Fourth Proportional to 1,421.70, 2,132.82 and 447.84

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Solution

The fourth proportional to 1,421.70, 2,132.82 and 447.84 is: 671.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.70 : 2,132.82 = 447.84 : x
  2. Step 2: Convert to fraction form
    1,421.70/2,132.82 = 447.84/x
  3. Step 3: Cross multiply
    1,421.70x = 2,132.82 × 447.84
  4. Step 4: Simplify right side
    1,421.70x = 955,162.11
  5. Step 5: Solve for x
    x = 955,162.11/1,421.70
  6. Step 6: Final answer
    x = 671.85

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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.