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Finding the Fourth Proportional to 128,137.80, 192,206.70 and 120,880.20

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Solution

The fourth proportional to 128,137.80, 192,206.70 and 120,880.20 is: 181,320.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,137.80 : 192,206.70 = 120,880.20 : x
  2. Step 2: Convert to fraction form
    128,137.80/192,206.70 = 120,880.20/x
  3. Step 3: Cross multiply
    128,137.80x = 192,206.70 × 120,880.20
  4. Step 4: Simplify right side
    128,137.80x = 23,233,984,337.34
  5. Step 5: Solve for x
    x = 23,233,984,337.34/128,137.80
  6. Step 6: Final answer
    x = 181,320.30

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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.