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Finding the Fourth Proportional to 128,068.94, 192,131.97 and 39,331.40

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Solution

The fourth proportional to 128,068.94, 192,131.97 and 39,331.40 is: 59,005.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,068.94 : 192,131.97 = 39,331.40 : x
  2. Step 2: Convert to fraction form
    128,068.94/192,131.97 = 39,331.40/x
  3. Step 3: Cross multiply
    128,068.94x = 192,131.97 × 39,331.40
  4. Step 4: Simplify right side
    128,068.94x = 7,556,819,364.86
  5. Step 5: Solve for x
    x = 7,556,819,364.86/128,068.94
  6. Step 6: Final answer
    x = 59,005.87

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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.