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Finding the Fourth Proportional to 231,639.70, 347,459.55 and 81,878.80

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Solution

The fourth proportional to 231,639.70, 347,459.55 and 81,878.80 is: 122,818.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,639.70 : 347,459.55 = 81,878.80 : x
  2. Step 2: Convert to fraction form
    231,639.70/347,459.55 = 81,878.80/x
  3. Step 3: Cross multiply
    231,639.70x = 347,459.55 × 81,878.80
  4. Step 4: Simplify right side
    231,639.70x = 28,449,571,002.54
  5. Step 5: Solve for x
    x = 28,449,571,002.54/231,639.70
  6. Step 6: Final answer
    x = 122,818.20

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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.