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Finding the Fourth Proportional to 81,753.50, 122,626.80 and 28,457.63

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Solution

The fourth proportional to 81,753.50, 122,626.80 and 28,457.63 is: 42,685.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,753.50 : 122,626.80 = 28,457.63 : x
  2. Step 2: Convert to fraction form
    81,753.50/122,626.80 = 28,457.63/x
  3. Step 3: Cross multiply
    81,753.50x = 122,626.80 × 28,457.63
  4. Step 4: Simplify right side
    81,753.50x = 3,489,667,489.35
  5. Step 5: Solve for x
    x = 3,489,667,489.35/81,753.50
  6. Step 6: Final answer
    x = 42,685.24

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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.