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Finding the Fourth Proportional to 128,026.80, 192,040.20 and 87,937.20

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Solution

The fourth proportional to 128,026.80, 192,040.20 and 87,937.20 is: 131,905.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,026.80 : 192,040.20 = 87,937.20 : x
  2. Step 2: Convert to fraction form
    128,026.80/192,040.20 = 87,937.20/x
  3. Step 3: Cross multiply
    128,026.80x = 192,040.20 × 87,937.20
  4. Step 4: Simplify right side
    128,026.80x = 16,887,477,475.44
  5. Step 5: Solve for x
    x = 16,887,477,475.44/128,026.80
  6. Step 6: Final answer
    x = 131,905.80

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1.5x scale

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.