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Finding the Fourth Proportional to 207,205.20, 311,038.20 and 128,408.40

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Solution

The fourth proportional to 207,205.20, 311,038.20 and 128,408.40 is: 192,755.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,205.20 : 311,038.20 = 128,408.40 : x
  2. Step 2: Convert to fraction form
    207,205.20/311,038.20 = 128,408.40/x
  3. Step 3: Cross multiply
    207,205.20x = 311,038.20 × 128,408.40
  4. Step 4: Simplify right side
    207,205.20x = 39,939,917,600.88
  5. Step 5: Solve for x
    x = 39,939,917,600.88/207,205.20
  6. Step 6: Final answer
    x = 192,755.38

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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.