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Finding the Fourth Proportional to 121,321.60, 181,982.40 and 74,600.80

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Solution

The fourth proportional to 121,321.60, 181,982.40 and 74,600.80 is: 111,901.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,321.60 : 181,982.40 = 74,600.80 : x
  2. Step 2: Convert to fraction form
    121,321.60/181,982.40 = 74,600.80/x
  3. Step 3: Cross multiply
    121,321.60x = 181,982.40 × 74,600.80
  4. Step 4: Simplify right side
    121,321.60x = 13,576,032,625.92
  5. Step 5: Solve for x
    x = 13,576,032,625.92/121,321.60
  6. Step 6: Final answer
    x = 111,901.20

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1.5x scale

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.