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Finding the Fourth Proportional to 262,915.80, 394,373.70 and 85,428.60

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Solution

The fourth proportional to 262,915.80, 394,373.70 and 85,428.60 is: 128,142.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    262,915.80 : 394,373.70 = 85,428.60 : x
  2. Step 2: Convert to fraction form
    262,915.80/394,373.70 = 85,428.60/x
  3. Step 3: Cross multiply
    262,915.80x = 394,373.70 × 85,428.60
  4. Step 4: Simplify right side
    262,915.80x = 33,690,793,067.82
  5. Step 5: Solve for x
    x = 33,690,793,067.82/262,915.80
  6. Step 6: Final answer
    x = 128,142.90

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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.