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Finding the Fourth Proportional to 528,078.60, 789,813.90 and 472,321.80

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Solution

The fourth proportional to 528,078.60, 789,813.90 and 472,321.80 is: 706,421.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,078.60 : 789,813.90 = 472,321.80 : x
  2. Step 2: Convert to fraction form
    528,078.60/789,813.90 = 472,321.80/x
  3. Step 3: Cross multiply
    528,078.60x = 789,813.90 × 472,321.80
  4. Step 4: Simplify right side
    528,078.60x = 373,046,322,913.02
  5. Step 5: Solve for x
    x = 373,046,322,913.02/528,078.60
  6. Step 6: Final answer
    x = 706,421.97

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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.