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Finding the Fourth Proportional to 213,731.20, 320,596.80 and 103,139.20

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Solution

The fourth proportional to 213,731.20, 320,596.80 and 103,139.20 is: 154,708.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,731.20 : 320,596.80 = 103,139.20 : x
  2. Step 2: Convert to fraction form
    213,731.20/320,596.80 = 103,139.20/x
  3. Step 3: Cross multiply
    213,731.20x = 320,596.80 × 103,139.20
  4. Step 4: Simplify right side
    213,731.20x = 33,066,097,474.56
  5. Step 5: Solve for x
    x = 33,066,097,474.56/213,731.20
  6. Step 6: Final answer
    x = 154,708.80

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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.