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Finding the Fourth Proportional to 122,643.40, 183,989.40 and 103,057.60

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Solution

The fourth proportional to 122,643.40, 183,989.40 and 103,057.60 is: 154,606.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,643.40 : 183,989.40 = 103,057.60 : x
  2. Step 2: Convert to fraction form
    122,643.40/183,989.40 = 103,057.60/x
  3. Step 3: Cross multiply
    122,643.40x = 183,989.40 × 103,057.60
  4. Step 4: Simplify right side
    122,643.40x = 18,961,505,989.44
  5. Step 5: Solve for x
    x = 18,961,505,989.44/122,643.40
  6. Step 6: Final answer
    x = 154,606.82

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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.