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Finding the Fourth Proportional to 128,254.20, 176,939.04 and 85,254.48

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Solution

The fourth proportional to 128,254.20, 176,939.04 and 85,254.48 is: 117,616.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,254.20 : 176,939.04 = 85,254.48 : x
  2. Step 2: Convert to fraction form
    128,254.20/176,939.04 = 85,254.48/x
  3. Step 3: Cross multiply
    128,254.20x = 176,939.04 × 85,254.48
  4. Step 4: Simplify right side
    128,254.20x = 15,084,845,846.90
  5. Step 5: Solve for x
    x = 15,084,845,846.90/128,254.20
  6. Step 6: Final answer
    x = 117,616.78

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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.