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Finding the Fourth Proportional to 208,561.20, 312,841.80 and 68,324.40

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Solution

The fourth proportional to 208,561.20, 312,841.80 and 68,324.40 is: 102,486.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,561.20 : 312,841.80 = 68,324.40 : x
  2. Step 2: Convert to fraction form
    208,561.20/312,841.80 = 68,324.40/x
  3. Step 3: Cross multiply
    208,561.20x = 312,841.80 × 68,324.40
  4. Step 4: Simplify right side
    208,561.20x = 21,374,728,279.92
  5. Step 5: Solve for x
    x = 21,374,728,279.92/208,561.20
  6. Step 6: Final answer
    x = 102,486.60

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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.