Home / 1,191.20-1,786.96-421.52

Finding the Fourth Proportional to 1,191.20, 1,786.96 and 421.52

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Solution

The fourth proportional to 1,191.20, 1,786.96 and 421.52 is: 632.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.20 : 1,786.96 = 421.52 : x
  2. Step 2: Convert to fraction form
    1,191.20/1,786.96 = 421.52/x
  3. Step 3: Cross multiply
    1,191.20x = 1,786.96 × 421.52
  4. Step 4: Simplify right side
    1,191.20x = 753,239.38
  5. Step 5: Solve for x
    x = 753,239.38/1,191.20
  6. Step 6: Final answer
    x = 632.34

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1.5x scale

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.