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Finding the Fourth Proportional to 789,640.61, 1,089,704.04 and 427,064.47

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Solution

The fourth proportional to 789,640.61, 1,089,704.04 and 427,064.47 is: 589,348.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    789,640.61 : 1,089,704.04 = 427,064.47 : x
  2. Step 2: Convert to fraction form
    789,640.61/1,089,704.04 = 427,064.47/x
  3. Step 3: Cross multiply
    789,640.61x = 1,089,704.04 × 427,064.47
  4. Step 4: Simplify right side
    789,640.61x = 465,373,875,575.20
  5. Step 5: Solve for x
    x = 465,373,875,575.20/789,640.61
  6. Step 6: Final answer
    x = 589,348.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.