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Finding the Fourth Proportional to 128,714.84, 177,601.14 and 80,940.44

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Solution

The fourth proportional to 128,714.84, 177,601.14 and 80,940.44 is: 111,681.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,714.84 : 177,601.14 = 80,940.44 : x
  2. Step 2: Convert to fraction form
    128,714.84/177,601.14 = 80,940.44/x
  3. Step 3: Cross multiply
    128,714.84x = 177,601.14 × 80,940.44
  4. Step 4: Simplify right side
    128,714.84x = 14,375,114,416.10
  5. Step 5: Solve for x
    x = 14,375,114,416.10/128,714.84
  6. Step 6: Final answer
    x = 111,681.87

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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.