Home / 20,921.72-31,383.66-5,339.48

Finding the Fourth Proportional to 20,921.72, 31,383.66 and 5,339.48

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Solution

The fourth proportional to 20,921.72, 31,383.66 and 5,339.48 is: 8,009.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,921.72 : 31,383.66 = 5,339.48 : x
  2. Step 2: Convert to fraction form
    20,921.72/31,383.66 = 5,339.48/x
  3. Step 3: Cross multiply
    20,921.72x = 31,383.66 × 5,339.48
  4. Step 4: Simplify right side
    20,921.72x = 167,572,424.90
  5. Step 5: Solve for x
    x = 167,572,424.90/20,921.72
  6. Step 6: Final answer
    x = 8,009.50

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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.