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Finding the Fourth Proportional to 259,620.40, 389,365.80 and 99,661.60

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Solution

The fourth proportional to 259,620.40, 389,365.80 and 99,661.60 is: 149,467.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,620.40 : 389,365.80 = 99,661.60 : x
  2. Step 2: Convert to fraction form
    259,620.40/389,365.80 = 99,661.60/x
  3. Step 3: Cross multiply
    259,620.40x = 389,365.80 × 99,661.60
  4. Step 4: Simplify right side
    259,620.40x = 38,804,818,613.28
  5. Step 5: Solve for x
    x = 38,804,818,613.28/259,620.40
  6. Step 6: Final answer
    x = 149,467.52

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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.