Home / 13,889.36-20,831.80-5,128.40

Finding the Fourth Proportional to 13,889.36, 20,831.80 and 5,128.40

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Solution

The fourth proportional to 13,889.36, 20,831.80 and 5,128.40 is: 7,691.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,889.36 : 20,831.80 = 5,128.40 : x
  2. Step 2: Convert to fraction form
    13,889.36/20,831.80 = 5,128.40/x
  3. Step 3: Cross multiply
    13,889.36x = 20,831.80 × 5,128.40
  4. Step 4: Simplify right side
    13,889.36x = 106,833,803.12
  5. Step 5: Solve for x
    x = 106,833,803.12/13,889.36
  6. Step 6: Final answer
    x = 7,691.77

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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.