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Finding the Fourth Proportional to 128,468.70, 192,703.05 and 81,755.10

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Solution

The fourth proportional to 128,468.70, 192,703.05 and 81,755.10 is: 122,632.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,468.70 : 192,703.05 = 81,755.10 : x
  2. Step 2: Convert to fraction form
    128,468.70/192,703.05 = 81,755.10/x
  3. Step 3: Cross multiply
    128,468.70x = 192,703.05 × 81,755.10
  4. Step 4: Simplify right side
    128,468.70x = 15,754,457,123.06
  5. Step 5: Solve for x
    x = 15,754,457,123.06/128,468.70
  6. Step 6: Final answer
    x = 122,632.65

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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.