Home / 1,191.12-1,786.68-421.44

Finding the Fourth Proportional to 1,191.12, 1,786.68 and 421.44

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Solution

The fourth proportional to 1,191.12, 1,786.68 and 421.44 is: 632.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.12 : 1,786.68 = 421.44 : x
  2. Step 2: Convert to fraction form
    1,191.12/1,786.68 = 421.44/x
  3. Step 3: Cross multiply
    1,191.12x = 1,786.68 × 421.44
  4. Step 4: Simplify right side
    1,191.12x = 752,978.42
  5. Step 5: Solve for x
    x = 752,978.42/1,191.12
  6. Step 6: Final answer
    x = 632.16

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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.