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Finding the Fourth Proportional to 128,300.70, 192,451.05 and 75,812.70

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Solution

The fourth proportional to 128,300.70, 192,451.05 and 75,812.70 is: 113,719.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,300.70 : 192,451.05 = 75,812.70 : x
  2. Step 2: Convert to fraction form
    128,300.70/192,451.05 = 75,812.70/x
  3. Step 3: Cross multiply
    128,300.70x = 192,451.05 × 75,812.70
  4. Step 4: Simplify right side
    128,300.70x = 14,590,233,718.34
  5. Step 5: Solve for x
    x = 14,590,233,718.34/128,300.70
  6. Step 6: Final answer
    x = 113,719.05

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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.