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Finding the Fourth Proportional to 121,149.60, 181,724.40 and 74,428.80

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Solution

The fourth proportional to 121,149.60, 181,724.40 and 74,428.80 is: 111,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,149.60 : 181,724.40 = 74,428.80 : x
  2. Step 2: Convert to fraction form
    121,149.60/181,724.40 = 74,428.80/x
  3. Step 3: Cross multiply
    121,149.60x = 181,724.40 × 74,428.80
  4. Step 4: Simplify right side
    121,149.60x = 13,525,529,022.72
  5. Step 5: Solve for x
    x = 13,525,529,022.72/121,149.60
  6. Step 6: Final answer
    x = 111,643.20

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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.