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Finding the Fourth Proportional to 1,421.92, 1,958 and 1,126.24

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Solution

The fourth proportional to 1,421.92, 1,958 and 1,126.24 is: 1,550.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.92 : 1,958 = 1,126.24 : x
  2. Step 2: Convert to fraction form
    1,421.92/1,958 = 1,126.24/x
  3. Step 3: Cross multiply
    1,421.92x = 1,958 × 1,126.24
  4. Step 4: Simplify right side
    1,421.92x = 2,205,177.92
  5. Step 5: Solve for x
    x = 2,205,177.92/1,421.92
  6. Step 6: Final answer
    x = 1,550.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.