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Finding the Fourth Proportional to 103,720.36, 155,640.90 and 43,745.08

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Solution

The fourth proportional to 103,720.36, 155,640.90 and 43,745.08 is: 65,643.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,720.36 : 155,640.90 = 43,745.08 : x
  2. Step 2: Convert to fraction form
    103,720.36/155,640.90 = 43,745.08/x
  3. Step 3: Cross multiply
    103,720.36x = 155,640.90 × 43,745.08
  4. Step 4: Simplify right side
    103,720.36x = 6,808,523,621.77
  5. Step 5: Solve for x
    x = 6,808,523,621.77/103,720.36
  6. Step 6: Final answer
    x = 65,643.08

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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.