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Finding the Fourth Proportional to 208,314.80, 312,488.40 and 68,087.60

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Solution

The fourth proportional to 208,314.80, 312,488.40 and 68,087.60 is: 102,136.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,314.80 : 312,488.40 = 68,087.60 : x
  2. Step 2: Convert to fraction form
    208,314.80/312,488.40 = 68,087.60/x
  3. Step 3: Cross multiply
    208,314.80x = 312,488.40 × 68,087.60
  4. Step 4: Simplify right side
    208,314.80x = 21,276,583,621.40
  5. Step 5: Solve for x
    x = 21,276,583,621.40/208,314.80
  6. Step 6: Final answer
    x = 102,136.69

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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.