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Finding the Fourth Proportional to 103,638.89, 155,440.94 and 28,766.64

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Solution

The fourth proportional to 103,638.89, 155,440.94 and 28,766.64 is: 43,145.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.89 : 155,440.94 = 28,766.64 : x
  2. Step 2: Convert to fraction form
    103,638.89/155,440.94 = 28,766.64/x
  3. Step 3: Cross multiply
    103,638.89x = 155,440.94 × 28,766.64
  4. Step 4: Simplify right side
    103,638.89x = 4,471,513,562.24
  5. Step 5: Solve for x
    x = 4,471,513,562.24/103,638.89
  6. Step 6: Final answer
    x = 43,145.13

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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.