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Finding the Fourth Proportional to 259,630.80, 389,417.40 and 72,661.20

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Solution

The fourth proportional to 259,630.80, 389,417.40 and 72,661.20 is: 108,983.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,630.80 : 389,417.40 = 72,661.20 : x
  2. Step 2: Convert to fraction form
    259,630.80/389,417.40 = 72,661.20/x
  3. Step 3: Cross multiply
    259,630.80x = 389,417.40 × 72,661.20
  4. Step 4: Simplify right side
    259,630.80x = 28,295,535,584.88
  5. Step 5: Solve for x
    x = 28,295,535,584.88/259,630.80
  6. Step 6: Final answer
    x = 108,983.74

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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.