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Finding the Fourth Proportional to 128,940.84, 177,892.74 and 84,254.76

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Solution

The fourth proportional to 128,940.84, 177,892.74 and 84,254.76 is: 116,241.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,940.84 : 177,892.74 = 84,254.76 : x
  2. Step 2: Convert to fraction form
    128,940.84/177,892.74 = 84,254.76/x
  3. Step 3: Cross multiply
    128,940.84x = 177,892.74 × 84,254.76
  4. Step 4: Simplify right side
    128,940.84x = 14,988,310,114.44
  5. Step 5: Solve for x
    x = 14,988,310,114.44/128,940.84
  6. Step 6: Final answer
    x = 116,241.76

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1.5x scale

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.