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Finding the Fourth Proportional to 81,323.60, 121,985.40 and 28,738.40

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Solution

The fourth proportional to 81,323.60, 121,985.40 and 28,738.40 is: 43,107.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,323.60 : 121,985.40 = 28,738.40 : x
  2. Step 2: Convert to fraction form
    81,323.60/121,985.40 = 28,738.40/x
  3. Step 3: Cross multiply
    81,323.60x = 121,985.40 × 28,738.40
  4. Step 4: Simplify right side
    81,323.60x = 3,505,665,219.36
  5. Step 5: Solve for x
    x = 3,505,665,219.36/81,323.60
  6. Step 6: Final answer
    x = 43,107.60

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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.