Home / 21,155.72-31,735.18-7,115.79

Finding the Fourth Proportional to 21,155.72, 31,735.18 and 7,115.79

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Solution

The fourth proportional to 21,155.72, 31,735.18 and 7,115.79 is: 10,674.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,155.72 : 31,735.18 = 7,115.79 : x
  2. Step 2: Convert to fraction form
    21,155.72/31,735.18 = 7,115.79/x
  3. Step 3: Cross multiply
    21,155.72x = 31,735.18 × 7,115.79
  4. Step 4: Simplify right side
    21,155.72x = 225,820,858.70
  5. Step 5: Solve for x
    x = 225,820,858.70/21,155.72
  6. Step 6: Final answer
    x = 10,674.22

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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.