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Finding the Fourth Proportional to 103,626.78, 155,440.20 and 28,765.77

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Solution

The fourth proportional to 103,626.78, 155,440.20 and 28,765.77 is: 43,148.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,626.78 : 155,440.20 = 28,765.77 : x
  2. Step 2: Convert to fraction form
    103,626.78/155,440.20 = 28,765.77/x
  3. Step 3: Cross multiply
    103,626.78x = 155,440.20 × 28,765.77
  4. Step 4: Simplify right side
    103,626.78x = 4,471,357,041.95
  5. Step 5: Solve for x
    x = 4,471,357,041.95/103,626.78
  6. Step 6: Final answer
    x = 43,148.66

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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.