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Finding the Fourth Proportional to 128,411.43, 192,490.79 and 75,035.67

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Solution

The fourth proportional to 128,411.43, 192,490.79 and 75,035.67 is: 112,479.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,411.43 : 192,490.79 = 75,035.67 : x
  2. Step 2: Convert to fraction form
    128,411.43/192,490.79 = 75,035.67/x
  3. Step 3: Cross multiply
    128,411.43x = 192,490.79 × 75,035.67
  4. Step 4: Simplify right side
    128,411.43x = 14,443,675,021.30
  5. Step 5: Solve for x
    x = 14,443,675,021.30/128,411.43
  6. Step 6: Final answer
    x = 112,479.67

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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.