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Finding the Fourth Proportional to 208,404.60, 312,606.90 and 68,129.40

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Solution

The fourth proportional to 208,404.60, 312,606.90 and 68,129.40 is: 102,194.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,404.60 : 312,606.90 = 68,129.40 : x
  2. Step 2: Convert to fraction form
    208,404.60/312,606.90 = 68,129.40/x
  3. Step 3: Cross multiply
    208,404.60x = 312,606.90 × 68,129.40
  4. Step 4: Simplify right side
    208,404.60x = 21,297,720,532.86
  5. Step 5: Solve for x
    x = 21,297,720,532.86/208,404.60
  6. Step 6: Final answer
    x = 102,194.10

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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.