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Finding the Fourth Proportional to 121,321.60, 181,982.40 and 115,878.40

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Solution

The fourth proportional to 121,321.60, 181,982.40 and 115,878.40 is: 173,817.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,321.60 : 181,982.40 = 115,878.40 : x
  2. Step 2: Convert to fraction form
    121,321.60/181,982.40 = 115,878.40/x
  3. Step 3: Cross multiply
    121,321.60x = 181,982.40 × 115,878.40
  4. Step 4: Simplify right side
    121,321.60x = 21,087,829,340.16
  5. Step 5: Solve for x
    x = 21,087,829,340.16/121,321.60
  6. Step 6: Final answer
    x = 173,817.60

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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.