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Finding the Fourth Proportional to 207,910.10, 311,865.15 and 128,767.70

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Solution

The fourth proportional to 207,910.10, 311,865.15 and 128,767.70 is: 193,151.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,910.10 : 311,865.15 = 128,767.70 : x
  2. Step 2: Convert to fraction form
    207,910.10/311,865.15 = 128,767.70/x
  3. Step 3: Cross multiply
    207,910.10x = 311,865.15 × 128,767.70
  4. Step 4: Simplify right side
    207,910.10x = 40,158,158,075.66
  5. Step 5: Solve for x
    x = 40,158,158,075.66/207,910.10
  6. Step 6: Final answer
    x = 193,151.55

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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.