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Finding the Fourth Proportional to 206,585.70, 309,878.61 and 66,442.74

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Solution

The fourth proportional to 206,585.70, 309,878.61 and 66,442.74 is: 99,664.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,585.70 : 309,878.61 = 66,442.74 : x
  2. Step 2: Convert to fraction form
    206,585.70/309,878.61 = 66,442.74/x
  3. Step 3: Cross multiply
    206,585.70x = 309,878.61 × 66,442.74
  4. Step 4: Simplify right side
    206,585.70x = 20,589,183,915.79
  5. Step 5: Solve for x
    x = 20,589,183,915.79/206,585.70
  6. Step 6: Final answer
    x = 99,664.13

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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.