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Finding the Fourth Proportional to 260,046.80, 389,778.60 and 133,638.20

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Solution

The fourth proportional to 260,046.80, 389,778.60 and 133,638.20 is: 200,307.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,046.80 : 389,778.60 = 133,638.20 : x
  2. Step 2: Convert to fraction form
    260,046.80/389,778.60 = 133,638.20/x
  3. Step 3: Cross multiply
    260,046.80x = 389,778.60 × 133,638.20
  4. Step 4: Simplify right side
    260,046.80x = 52,089,310,502.52
  5. Step 5: Solve for x
    x = 52,089,310,502.52/260,046.80
  6. Step 6: Final answer
    x = 200,307.45

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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.