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Finding the Fourth Proportional to 1,811.03, 2,499.80 and 1,392.77

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Solution

The fourth proportional to 1,811.03, 2,499.80 and 1,392.77 is: 1,922.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.03 : 2,499.80 = 1,392.77 : x
  2. Step 2: Convert to fraction form
    1,811.03/2,499.80 = 1,392.77/x
  3. Step 3: Cross multiply
    1,811.03x = 2,499.80 × 1,392.77
  4. Step 4: Simplify right side
    1,811.03x = 3,481,646.45
  5. Step 5: Solve for x
    x = 3,481,646.45/1,811.03
  6. Step 6: Final answer
    x = 1,922.47

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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.