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Finding the Fourth Proportional to 205,911.40, 309,039.90 and 100,820.20

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Solution

The fourth proportional to 205,911.40, 309,039.90 and 100,820.20 is: 151,314.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,911.40 : 309,039.90 = 100,820.20 : x
  2. Step 2: Convert to fraction form
    205,911.40/309,039.90 = 100,820.20/x
  3. Step 3: Cross multiply
    205,911.40x = 309,039.90 × 100,820.20
  4. Step 4: Simplify right side
    205,911.40x = 31,157,464,525.98
  5. Step 5: Solve for x
    x = 31,157,464,525.98/205,911.40
  6. Step 6: Final answer
    x = 151,314.91

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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.