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Finding the Fourth Proportional to 128,399, 192,644.12 and 57,315.20

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Solution

The fourth proportional to 128,399, 192,644.12 and 57,315.20 is: 85,993.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,399 : 192,644.12 = 57,315.20 : x
  2. Step 2: Convert to fraction form
    128,399/192,644.12 = 57,315.20/x
  3. Step 3: Cross multiply
    128,399x = 192,644.12 × 57,315.20
  4. Step 4: Simplify right side
    128,399x = 11,041,436,266.62
  5. Step 5: Solve for x
    x = 11,041,436,266.62/128,399
  6. Step 6: Final answer
    x = 85,993.16

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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.