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Finding the Fourth Proportional to 661,550.40, 991,231.20 and 380,577.60

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Solution

The fourth proportional to 661,550.40, 991,231.20 and 380,577.60 is: 570,236.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,550.40 : 991,231.20 = 380,577.60 : x
  2. Step 2: Convert to fraction form
    661,550.40/991,231.20 = 380,577.60/x
  3. Step 3: Cross multiply
    661,550.40x = 991,231.20 × 380,577.60
  4. Step 4: Simplify right side
    661,550.40x = 377,240,391,141.12
  5. Step 5: Solve for x
    x = 377,240,391,141.12/661,550.40
  6. Step 6: Final answer
    x = 570,236.81

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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.