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Finding the Fourth Proportional to 128,105.40, 191,639.70 and 112,553.40

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Solution

The fourth proportional to 128,105.40, 191,639.70 and 112,553.40 is: 168,374.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,105.40 : 191,639.70 = 112,553.40 : x
  2. Step 2: Convert to fraction form
    128,105.40/191,639.70 = 112,553.40/x
  3. Step 3: Cross multiply
    128,105.40x = 191,639.70 × 112,553.40
  4. Step 4: Simplify right side
    128,105.40x = 21,569,699,809.98
  5. Step 5: Solve for x
    x = 21,569,699,809.98/128,105.40
  6. Step 6: Final answer
    x = 168,374.63

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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.