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Finding the Fourth Proportional to 339,989.20, 509,983.80 and 204,686.80

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Solution

The fourth proportional to 339,989.20, 509,983.80 and 204,686.80 is: 307,030.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,989.20 : 509,983.80 = 204,686.80 : x
  2. Step 2: Convert to fraction form
    339,989.20/509,983.80 = 204,686.80/x
  3. Step 3: Cross multiply
    339,989.20x = 509,983.80 × 204,686.80
  4. Step 4: Simplify right side
    339,989.20x = 104,386,952,073.84
  5. Step 5: Solve for x
    x = 104,386,952,073.84/339,989.20
  6. Step 6: Final answer
    x = 307,030.20

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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.