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Finding the Fourth Proportional to 81,639.40, 122,430.30 and 37,287.40

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Solution

The fourth proportional to 81,639.40, 122,430.30 and 37,287.40 is: 55,917.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,639.40 : 122,430.30 = 37,287.40 : x
  2. Step 2: Convert to fraction form
    81,639.40/122,430.30 = 37,287.40/x
  3. Step 3: Cross multiply
    81,639.40x = 122,430.30 × 37,287.40
  4. Step 4: Simplify right side
    81,639.40x = 4,565,107,568.22
  5. Step 5: Solve for x
    x = 4,565,107,568.22/81,639.40
  6. Step 6: Final answer
    x = 55,917.95

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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.