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Finding the Fourth Proportional to 1,421.94, 2,133.12 and 447.82

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Solution

The fourth proportional to 1,421.94, 2,133.12 and 447.82 is: 671.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.94 : 2,133.12 = 447.82 : x
  2. Step 2: Convert to fraction form
    1,421.94/2,133.12 = 447.82/x
  3. Step 3: Cross multiply
    1,421.94x = 2,133.12 × 447.82
  4. Step 4: Simplify right side
    1,421.94x = 955,253.80
  5. Step 5: Solve for x
    x = 955,253.80/1,421.94
  6. Step 6: Final answer
    x = 671.80

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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.