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Finding the Fourth Proportional to 207,256.70, 311,115.45 and 128,459.90

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Solution

The fourth proportional to 207,256.70, 311,115.45 and 128,459.90 is: 192,832.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,256.70 : 311,115.45 = 128,459.90 : x
  2. Step 2: Convert to fraction form
    207,256.70/311,115.45 = 128,459.90/x
  3. Step 3: Cross multiply
    207,256.70x = 311,115.45 × 128,459.90
  4. Step 4: Simplify right side
    207,256.70x = 39,965,859,595.46
  5. Step 5: Solve for x
    x = 39,965,859,595.46/207,256.70
  6. Step 6: Final answer
    x = 192,832.65

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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.