Home / 11,321.79-15,617.65-7,122.75

Finding the Fourth Proportional to 11,321.79, 15,617.65 and 7,122.75

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Solution

The fourth proportional to 11,321.79, 15,617.65 and 7,122.75 is: 9,825.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,321.79 : 15,617.65 = 7,122.75 : x
  2. Step 2: Convert to fraction form
    11,321.79/15,617.65 = 7,122.75/x
  3. Step 3: Cross multiply
    11,321.79x = 15,617.65 × 7,122.75
  4. Step 4: Simplify right side
    11,321.79x = 111,240,616.54
  5. Step 5: Solve for x
    x = 111,240,616.54/11,321.79
  6. Step 6: Final answer
    x = 9,825.36

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Half scale
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1.5x scale

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.