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Finding the Fourth Proportional to 103,638.53, 155,457.78 and 28,758.68

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Solution

The fourth proportional to 103,638.53, 155,457.78 and 28,758.68 is: 43,138.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,638.53 : 155,457.78 = 28,758.68 : x
  2. Step 2: Convert to fraction form
    103,638.53/155,457.78 = 28,758.68/x
  3. Step 3: Cross multiply
    103,638.53x = 155,457.78 × 28,758.68
  4. Step 4: Simplify right side
    103,638.53x = 4,470,760,548.53
  5. Step 5: Solve for x
    x = 4,470,760,548.53/103,638.53
  6. Step 6: Final answer
    x = 43,138.02

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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.