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Finding the Fourth Proportional to 128,258.45, 192,219.90 and 68,966.45

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Solution

The fourth proportional to 128,258.45, 192,219.90 and 68,966.45 is: 103,359.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,258.45 : 192,219.90 = 68,966.45 : x
  2. Step 2: Convert to fraction form
    128,258.45/192,219.90 = 68,966.45/x
  3. Step 3: Cross multiply
    128,258.45x = 192,219.90 × 68,966.45
  4. Step 4: Simplify right side
    128,258.45x = 13,256,724,122.36
  5. Step 5: Solve for x
    x = 13,256,724,122.36/128,258.45
  6. Step 6: Final answer
    x = 103,359.46

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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.