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Finding the Fourth Proportional to 81,490.80, 122,257.80 and 28,894.80

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Solution

The fourth proportional to 81,490.80, 122,257.80 and 28,894.80 is: 43,349.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,490.80 : 122,257.80 = 28,894.80 : x
  2. Step 2: Convert to fraction form
    81,490.80/122,257.80 = 28,894.80/x
  3. Step 3: Cross multiply
    81,490.80x = 122,257.80 × 28,894.80
  4. Step 4: Simplify right side
    81,490.80x = 3,532,614,679.44
  5. Step 5: Solve for x
    x = 3,532,614,679.44/81,490.80
  6. Step 6: Final answer
    x = 43,349.86

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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.