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Finding the Fourth Proportional to 128,712.84, 177,598.38 and 80,938.44

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Solution

The fourth proportional to 128,712.84, 177,598.38 and 80,938.44 is: 111,679.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,712.84 : 177,598.38 = 80,938.44 : x
  2. Step 2: Convert to fraction form
    128,712.84/177,598.38 = 80,938.44/x
  3. Step 3: Cross multiply
    128,712.84x = 177,598.38 × 80,938.44
  4. Step 4: Simplify right side
    128,712.84x = 14,374,535,823.73
  5. Step 5: Solve for x
    x = 14,374,535,823.73/128,712.84
  6. Step 6: Final answer
    x = 111,679.11

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.