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Finding the Fourth Proportional to 103,620.78, 155,431.20 and 28,759.77

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Solution

The fourth proportional to 103,620.78, 155,431.20 and 28,759.77 is: 43,139.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,620.78 : 155,431.20 = 28,759.77 : x
  2. Step 2: Convert to fraction form
    103,620.78/155,431.20 = 28,759.77/x
  3. Step 3: Cross multiply
    103,620.78x = 155,431.20 × 28,759.77
  4. Step 4: Simplify right side
    103,620.78x = 4,470,165,562.82
  5. Step 5: Solve for x
    x = 4,470,165,562.82/103,620.78
  6. Step 6: Final answer
    x = 43,139.66

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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.