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Finding the Fourth Proportional to 81,576.95, 122,389.11 and 28,990.53

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Solution

The fourth proportional to 81,576.95, 122,389.11 and 28,990.53 is: 43,494.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,576.95 : 122,389.11 = 28,990.53 : x
  2. Step 2: Convert to fraction form
    81,576.95/122,389.11 = 28,990.53/x
  3. Step 3: Cross multiply
    81,576.95x = 122,389.11 × 28,990.53
  4. Step 4: Simplify right side
    81,576.95x = 3,548,125,165.13
  5. Step 5: Solve for x
    x = 3,548,125,165.13/81,576.95
  6. Step 6: Final answer
    x = 43,494.21

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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.