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Finding the Fourth Proportional to 1,393.87, 2,091 and 469.22

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Solution

The fourth proportional to 1,393.87, 2,091 and 469.22 is: 703.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.87 : 2,091 = 469.22 : x
  2. Step 2: Convert to fraction form
    1,393.87/2,091 = 469.22/x
  3. Step 3: Cross multiply
    1,393.87x = 2,091 × 469.22
  4. Step 4: Simplify right side
    1,393.87x = 981,139.02
  5. Step 5: Solve for x
    x = 981,139.02/1,393.87
  6. Step 6: Final answer
    x = 703.90

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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.