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Finding the Fourth Proportional to 259,246.40, 388,821.60 and 72,219.20

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Solution

The fourth proportional to 259,246.40, 388,821.60 and 72,219.20 is: 108,315.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,246.40 : 388,821.60 = 72,219.20 : x
  2. Step 2: Convert to fraction form
    259,246.40/388,821.60 = 72,219.20/x
  3. Step 3: Cross multiply
    259,246.40x = 388,821.60 × 72,219.20
  4. Step 4: Simplify right side
    259,246.40x = 28,080,384,894.72
  5. Step 5: Solve for x
    x = 28,080,384,894.72/259,246.40
  6. Step 6: Final answer
    x = 108,315.43

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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.