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Finding the Fourth Proportional to 206,574.90, 309,905.55 and 66,347.70

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Solution

The fourth proportional to 206,574.90, 309,905.55 and 66,347.70 is: 99,535.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,574.90 : 309,905.55 = 66,347.70 : x
  2. Step 2: Convert to fraction form
    206,574.90/309,905.55 = 66,347.70/x
  3. Step 3: Cross multiply
    206,574.90x = 309,905.55 × 66,347.70
  4. Step 4: Simplify right side
    206,574.90x = 20,561,520,459.74
  5. Step 5: Solve for x
    x = 20,561,520,459.74/206,574.90
  6. Step 6: Final answer
    x = 99,535.42

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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.