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Finding the Fourth Proportional to 231,816.40, 347,724.60 and 142,781.20

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Solution

The fourth proportional to 231,816.40, 347,724.60 and 142,781.20 is: 214,171.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,816.40 : 347,724.60 = 142,781.20 : x
  2. Step 2: Convert to fraction form
    231,816.40/347,724.60 = 142,781.20/x
  3. Step 3: Cross multiply
    231,816.40x = 347,724.60 × 142,781.20
  4. Step 4: Simplify right side
    231,816.40x = 49,648,535,657.52
  5. Step 5: Solve for x
    x = 49,648,535,657.52/231,816.40
  6. Step 6: Final answer
    x = 214,171.80

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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.