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Finding the Fourth Proportional to 13,881.55, 20,831.55 and 6,486.58

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Solution

The fourth proportional to 13,881.55, 20,831.55 and 6,486.58 is: 9,734.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,881.55 : 20,831.55 = 6,486.58 : x
  2. Step 2: Convert to fraction form
    13,881.55/20,831.55 = 6,486.58/x
  3. Step 3: Cross multiply
    13,881.55x = 20,831.55 × 6,486.58
  4. Step 4: Simplify right side
    13,881.55x = 135,125,515.60
  5. Step 5: Solve for x
    x = 135,125,515.60/13,881.55
  6. Step 6: Final answer
    x = 9,734.18

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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.