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Finding the Fourth Proportional to 81,348.56, 122,039.95 and 28,045.50

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Solution

The fourth proportional to 81,348.56, 122,039.95 and 28,045.50 is: 42,074.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,348.56 : 122,039.95 = 28,045.50 : x
  2. Step 2: Convert to fraction form
    81,348.56/122,039.95 = 28,045.50/x
  3. Step 3: Cross multiply
    81,348.56x = 122,039.95 × 28,045.50
  4. Step 4: Simplify right side
    81,348.56x = 3,422,671,417.73
  5. Step 5: Solve for x
    x = 3,422,671,417.73/81,348.56
  6. Step 6: Final answer
    x = 42,074.15

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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.