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Finding the Fourth Proportional to 1,781.92, 2,458.87 and 1,222.87

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Solution

The fourth proportional to 1,781.92, 2,458.87 and 1,222.87 is: 1,687.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,781.92 : 2,458.87 = 1,222.87 : x
  2. Step 2: Convert to fraction form
    1,781.92/2,458.87 = 1,222.87/x
  3. Step 3: Cross multiply
    1,781.92x = 2,458.87 × 1,222.87
  4. Step 4: Simplify right side
    1,781.92x = 3,006,878.36
  5. Step 5: Solve for x
    x = 3,006,878.36/1,781.92
  6. Step 6: Final answer
    x = 1,687.44

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1.5x scale

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.