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Finding the Fourth Proportional to 206,438.40, 309,657.60 and 66,211.20

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Solution

The fourth proportional to 206,438.40, 309,657.60 and 66,211.20 is: 99,316.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,438.40 : 309,657.60 = 66,211.20 : x
  2. Step 2: Convert to fraction form
    206,438.40/309,657.60 = 66,211.20/x
  3. Step 3: Cross multiply
    206,438.40x = 309,657.60 × 66,211.20
  4. Step 4: Simplify right side
    206,438.40x = 20,502,801,285.12
  5. Step 5: Solve for x
    x = 20,502,801,285.12/206,438.40
  6. Step 6: Final answer
    x = 99,316.80

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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.