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Finding the Fourth Proportional to 388,310.40, 582,465.60 and 138,902.40

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Solution

The fourth proportional to 388,310.40, 582,465.60 and 138,902.40 is: 208,353.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,310.40 : 582,465.60 = 138,902.40 : x
  2. Step 2: Convert to fraction form
    388,310.40/582,465.60 = 138,902.40/x
  3. Step 3: Cross multiply
    388,310.40x = 582,465.60 × 138,902.40
  4. Step 4: Simplify right side
    388,310.40x = 80,905,869,757.44
  5. Step 5: Solve for x
    x = 80,905,869,757.44/388,310.40
  6. Step 6: Final answer
    x = 208,353.60

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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.