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Finding the Fourth Proportional to 206,139.20, 289,009.60 and 206,139.20

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Solution

The fourth proportional to 206,139.20, 289,009.60 and 206,139.20 is: 289,009.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,139.20 : 289,009.60 = 206,139.20 : x
  2. Step 2: Convert to fraction form
    206,139.20/289,009.60 = 206,139.20/x
  3. Step 3: Cross multiply
    206,139.20x = 289,009.60 × 206,139.20
  4. Step 4: Simplify right side
    206,139.20x = 59,576,207,736.32
  5. Step 5: Solve for x
    x = 59,576,207,736.32/206,139.20
  6. Step 6: Final answer
    x = 289,009.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.