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Finding the Fourth Proportional to 128,082.06, 192,123.09 and 65,712.78

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Solution

The fourth proportional to 128,082.06, 192,123.09 and 65,712.78 is: 98,569.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,082.06 : 192,123.09 = 65,712.78 : x
  2. Step 2: Convert to fraction form
    128,082.06/192,123.09 = 65,712.78/x
  3. Step 3: Cross multiply
    128,082.06x = 192,123.09 × 65,712.78
  4. Step 4: Simplify right side
    128,082.06x = 12,624,942,346.09
  5. Step 5: Solve for x
    x = 12,624,942,346.09/128,082.06
  6. Step 6: Final answer
    x = 98,569.17

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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.