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Finding the Fourth Proportional to 789,578.90, 1,089,627.44 and 427,009.80

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Solution

The fourth proportional to 789,578.90, 1,089,627.44 and 427,009.80 is: 589,278.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    789,578.90 : 1,089,627.44 = 427,009.80 : x
  2. Step 2: Convert to fraction form
    789,578.90/1,089,627.44 = 427,009.80/x
  3. Step 3: Cross multiply
    789,578.90x = 1,089,627.44 × 427,009.80
  4. Step 4: Simplify right side
    789,578.90x = 465,281,593,093.86
  5. Step 5: Solve for x
    x = 465,281,593,093.86/789,578.90
  6. Step 6: Final answer
    x = 589,278.15

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Double scale
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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.