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Finding the Fourth Proportional to 789,641.80, 1,089,705.68 and 427,065.66

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Solution

The fourth proportional to 789,641.80, 1,089,705.68 and 427,065.66 is: 589,350.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    789,641.80 : 1,089,705.68 = 427,065.66 : x
  2. Step 2: Convert to fraction form
    789,641.80/1,089,705.68 = 427,065.66/x
  3. Step 3: Cross multiply
    789,641.80x = 1,089,705.68 × 427,065.66
  4. Step 4: Simplify right side
    789,641.80x = 465,375,875,434.95
  5. Step 5: Solve for x
    x = 465,375,875,434.95/789,641.80
  6. Step 6: Final answer
    x = 589,350.61

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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.