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Finding the Fourth Proportional to 121,109.60, 181,664.40 and 74,388.80

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Solution

The fourth proportional to 121,109.60, 181,664.40 and 74,388.80 is: 111,583.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,109.60 : 181,664.40 = 74,388.80 : x
  2. Step 2: Convert to fraction form
    121,109.60/181,664.40 = 74,388.80/x
  3. Step 3: Cross multiply
    121,109.60x = 181,664.40 × 74,388.80
  4. Step 4: Simplify right side
    121,109.60x = 13,513,796,718.72
  5. Step 5: Solve for x
    x = 13,513,796,718.72/121,109.60
  6. Step 6: Final answer
    x = 111,583.20

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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.