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Finding the Fourth Proportional to 128,402.40, 192,649.07 and 57,318.42

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Solution

The fourth proportional to 128,402.40, 192,649.07 and 57,318.42 is: 85,997.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,402.40 : 192,649.07 = 57,318.42 : x
  2. Step 2: Convert to fraction form
    128,402.40/192,649.07 = 57,318.42/x
  3. Step 3: Cross multiply
    128,402.40x = 192,649.07 × 57,318.42
  4. Step 4: Simplify right side
    128,402.40x = 11,042,340,306.87
  5. Step 5: Solve for x
    x = 11,042,340,306.87/128,402.40
  6. Step 6: Final answer
    x = 85,997.93

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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.