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Finding the Fourth Proportional to 81,589.50, 122,401.80 and 25,428.42

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Solution

The fourth proportional to 81,589.50, 122,401.80 and 25,428.42 is: 38,148.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,589.50 : 122,401.80 = 25,428.42 : x
  2. Step 2: Convert to fraction form
    81,589.50/122,401.80 = 25,428.42/x
  3. Step 3: Cross multiply
    81,589.50x = 122,401.80 × 25,428.42
  4. Step 4: Simplify right side
    81,589.50x = 3,112,484,379.16
  5. Step 5: Solve for x
    x = 3,112,484,379.16/81,589.50
  6. Step 6: Final answer
    x = 38,148.10

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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.