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Finding the Fourth Proportional to 25,281.80, 37,890.30 and 12,105.80

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Solution

The fourth proportional to 25,281.80, 37,890.30 and 12,105.80 is: 18,143.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,281.80 : 37,890.30 = 12,105.80 : x
  2. Step 2: Convert to fraction form
    25,281.80/37,890.30 = 12,105.80/x
  3. Step 3: Cross multiply
    25,281.80x = 37,890.30 × 12,105.80
  4. Step 4: Simplify right side
    25,281.80x = 458,692,393.74
  5. Step 5: Solve for x
    x = 458,692,393.74/25,281.80
  6. Step 6: Final answer
    x = 18,143.19

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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.