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Finding the Fourth Proportional to 339,705.20, 508,974.60 and 221,315.60

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Solution

The fourth proportional to 339,705.20, 508,974.60 and 221,315.60 is: 331,593.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,705.20 : 508,974.60 = 221,315.60 : x
  2. Step 2: Convert to fraction form
    339,705.20/508,974.60 = 221,315.60/x
  3. Step 3: Cross multiply
    339,705.20x = 508,974.60 × 221,315.60
  4. Step 4: Simplify right side
    339,705.20x = 112,644,018,983.76
  5. Step 5: Solve for x
    x = 112,644,018,983.76/339,705.20
  6. Step 6: Final answer
    x = 331,593.45

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1.5x scale

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.