Home / 13,985.40-20,981.72-5,220.39

Finding the Fourth Proportional to 13,985.40, 20,981.72 and 5,220.39

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Solution

The fourth proportional to 13,985.40, 20,981.72 and 5,220.39 is: 7,831.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.40 : 20,981.72 = 5,220.39 : x
  2. Step 2: Convert to fraction form
    13,985.40/20,981.72 = 5,220.39/x
  3. Step 3: Cross multiply
    13,985.40x = 20,981.72 × 5,220.39
  4. Step 4: Simplify right side
    13,985.40x = 109,532,735.17
  5. Step 5: Solve for x
    x = 109,532,735.17/13,985.40
  6. Step 6: Final answer
    x = 7,831.93

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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.