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Finding the Fourth Proportional to 128,938.40, 193,407.60 and 81,699.20

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Solution

The fourth proportional to 128,938.40, 193,407.60 and 81,699.20 is: 122,548.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,938.40 : 193,407.60 = 81,699.20 : x
  2. Step 2: Convert to fraction form
    128,938.40/193,407.60 = 81,699.20/x
  3. Step 3: Cross multiply
    128,938.40x = 193,407.60 × 81,699.20
  4. Step 4: Simplify right side
    128,938.40x = 15,801,246,193.92
  5. Step 5: Solve for x
    x = 15,801,246,193.92/128,938.40
  6. Step 6: Final answer
    x = 122,548.80

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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.