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Finding the Fourth Proportional to 208,000.28, 311,388.06 and 128,860.04

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Solution

The fourth proportional to 208,000.28, 311,388.06 and 128,860.04 is: 192,910.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,000.28 : 311,388.06 = 128,860.04 : x
  2. Step 2: Convert to fraction form
    208,000.28/311,388.06 = 128,860.04/x
  3. Step 3: Cross multiply
    208,000.28x = 311,388.06 × 128,860.04
  4. Step 4: Simplify right side
    208,000.28x = 40,125,477,867.12
  5. Step 5: Solve for x
    x = 40,125,477,867.12/208,000.28
  6. Step 6: Final answer
    x = 192,910.69

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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.