Home / 20,979.48-31,474.63-7,831.96

Finding the Fourth Proportional to 20,979.48, 31,474.63 and 7,831.96

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Solution

The fourth proportional to 20,979.48, 31,474.63 and 7,831.96 is: 11,749.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.48 : 31,474.63 = 7,831.96 : x
  2. Step 2: Convert to fraction form
    20,979.48/31,474.63 = 7,831.96/x
  3. Step 3: Cross multiply
    20,979.48x = 31,474.63 × 7,831.96
  4. Step 4: Simplify right side
    20,979.48x = 246,508,043.17
  5. Step 5: Solve for x
    x = 246,508,043.17/20,979.48
  6. Step 6: Final answer
    x = 11,749.96

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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.