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Finding the Fourth Proportional to 1,421.81, 2,132.86 and 447.83

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Solution

The fourth proportional to 1,421.81, 2,132.86 and 447.83 is: 671.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.81 : 2,132.86 = 447.83 : x
  2. Step 2: Convert to fraction form
    1,421.81/2,132.86 = 447.83/x
  3. Step 3: Cross multiply
    1,421.81x = 2,132.86 × 447.83
  4. Step 4: Simplify right side
    1,421.81x = 955,158.69
  5. Step 5: Solve for x
    x = 955,158.69/1,421.81
  6. Step 6: Final answer
    x = 671.79

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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.