Home / 1,151.27-1,725.36-420.15

Finding the Fourth Proportional to 1,151.27, 1,725.36 and 420.15

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Solution

The fourth proportional to 1,151.27, 1,725.36 and 420.15 is: 629.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.27 : 1,725.36 = 420.15 : x
  2. Step 2: Convert to fraction form
    1,151.27/1,725.36 = 420.15/x
  3. Step 3: Cross multiply
    1,151.27x = 1,725.36 × 420.15
  4. Step 4: Simplify right side
    1,151.27x = 724,910.00
  5. Step 5: Solve for x
    x = 724,910.00/1,151.27
  6. Step 6: Final answer
    x = 629.66

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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.