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Finding the Fourth Proportional to 128,811.20, 193,126.80 and 76,193.60

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Solution

The fourth proportional to 128,811.20, 193,126.80 and 76,193.60 is: 114,237.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,811.20 : 193,126.80 = 76,193.60 : x
  2. Step 2: Convert to fraction form
    128,811.20/193,126.80 = 76,193.60/x
  3. Step 3: Cross multiply
    128,811.20x = 193,126.80 × 76,193.60
  4. Step 4: Simplify right side
    128,811.20x = 14,715,026,148.48
  5. Step 5: Solve for x
    x = 14,715,026,148.48/128,811.20
  6. Step 6: Final answer
    x = 114,237.16

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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.