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Finding the Fourth Proportional to 208,068.20, 311,324.70 and 138,084.20

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Solution

The fourth proportional to 208,068.20, 311,324.70 and 138,084.20 is: 206,610.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,068.20 : 311,324.70 = 138,084.20 : x
  2. Step 2: Convert to fraction form
    208,068.20/311,324.70 = 138,084.20/x
  3. Step 3: Cross multiply
    208,068.20x = 311,324.70 × 138,084.20
  4. Step 4: Simplify right side
    208,068.20x = 42,989,022,139.74
  5. Step 5: Solve for x
    x = 42,989,022,139.74/208,068.20
  6. Step 6: Final answer
    x = 206,610.25

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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.