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Finding the Fourth Proportional to 81,303.40, 121,993.44 and 28,737.64

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Solution

The fourth proportional to 81,303.40, 121,993.44 and 28,737.64 is: 43,120.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,303.40 : 121,993.44 = 28,737.64 : x
  2. Step 2: Convert to fraction form
    81,303.40/121,993.44 = 28,737.64/x
  3. Step 3: Cross multiply
    81,303.40x = 121,993.44 × 28,737.64
  4. Step 4: Simplify right side
    81,303.40x = 3,505,803,561.08
  5. Step 5: Solve for x
    x = 3,505,803,561.08/81,303.40
  6. Step 6: Final answer
    x = 43,120.01

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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.