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Finding the Fourth Proportional to 128,399.44, 192,599.68 and 84,305.20

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Solution

The fourth proportional to 128,399.44, 192,599.68 and 84,305.20 is: 126,458.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,399.44 : 192,599.68 = 84,305.20 : x
  2. Step 2: Convert to fraction form
    128,399.44/192,599.68 = 84,305.20/x
  3. Step 3: Cross multiply
    128,399.44x = 192,599.68 × 84,305.20
  4. Step 4: Simplify right side
    128,399.44x = 16,237,154,542.34
  5. Step 5: Solve for x
    x = 16,237,154,542.34/128,399.44
  6. Step 6: Final answer
    x = 126,458.14

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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.