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Finding the Fourth Proportional to 2,221.91, 3,332.94 and 661.87

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Solution

The fourth proportional to 2,221.91, 3,332.94 and 661.87 is: 992.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.91 : 3,332.94 = 661.87 : x
  2. Step 2: Convert to fraction form
    2,221.91/3,332.94 = 661.87/x
  3. Step 3: Cross multiply
    2,221.91x = 3,332.94 × 661.87
  4. Step 4: Simplify right side
    2,221.91x = 2,205,953.02
  5. Step 5: Solve for x
    x = 2,205,953.02/2,221.91
  6. Step 6: Final answer
    x = 992.82

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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.