Home / 21,220.92-31,831.56-5,638.68

Finding the Fourth Proportional to 21,220.92, 31,831.56 and 5,638.68

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Solution

The fourth proportional to 21,220.92, 31,831.56 and 5,638.68 is: 8,458.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.92 : 31,831.56 = 5,638.68 : x
  2. Step 2: Convert to fraction form
    21,220.92/31,831.56 = 5,638.68/x
  3. Step 3: Cross multiply
    21,220.92x = 31,831.56 × 5,638.68
  4. Step 4: Simplify right side
    21,220.92x = 179,487,980.74
  5. Step 5: Solve for x
    x = 179,487,980.74/21,220.92
  6. Step 6: Final answer
    x = 8,458.07

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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.