Home / 13,221.51-19,831.70-5,321.72

Finding the Fourth Proportional to 13,221.51, 19,831.70 and 5,321.72

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Solution

The fourth proportional to 13,221.51, 19,831.70 and 5,321.72 is: 7,982.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,221.51 : 19,831.70 = 5,321.72 : x
  2. Step 2: Convert to fraction form
    13,221.51/19,831.70 = 5,321.72/x
  3. Step 3: Cross multiply
    13,221.51x = 19,831.70 × 5,321.72
  4. Step 4: Simplify right side
    13,221.51x = 105,538,628.76
  5. Step 5: Solve for x
    x = 105,538,628.76/13,221.51
  6. Step 6: Final answer
    x = 7,982.34

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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.