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Finding the Fourth Proportional to 138,515.60, 207,773.40 and 55,409.60

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Solution

The fourth proportional to 138,515.60, 207,773.40 and 55,409.60 is: 83,114.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,515.60 : 207,773.40 = 55,409.60 : x
  2. Step 2: Convert to fraction form
    138,515.60/207,773.40 = 55,409.60/x
  3. Step 3: Cross multiply
    138,515.60x = 207,773.40 × 55,409.60
  4. Step 4: Simplify right side
    138,515.60x = 11,512,640,984.64
  5. Step 5: Solve for x
    x = 11,512,640,984.64/138,515.60
  6. Step 6: Final answer
    x = 83,114.40

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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.