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Finding the Fourth Proportional to 207,707.70, 311,561.55 and 128,910.90

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Solution

The fourth proportional to 207,707.70, 311,561.55 and 128,910.90 is: 193,366.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,707.70 : 311,561.55 = 128,910.90 : x
  2. Step 2: Convert to fraction form
    207,707.70/311,561.55 = 128,910.90/x
  3. Step 3: Cross multiply
    207,707.70x = 311,561.55 × 128,910.90
  4. Step 4: Simplify right side
    207,707.70x = 40,163,679,815.90
  5. Step 5: Solve for x
    x = 40,163,679,815.90/207,707.70
  6. Step 6: Final answer
    x = 193,366.35

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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.