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Finding the Fourth Proportional to 82,768.70, 124,153.05 and 20,439.20

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Solution

The fourth proportional to 82,768.70, 124,153.05 and 20,439.20 is: 30,658.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,768.70 : 124,153.05 = 20,439.20 : x
  2. Step 2: Convert to fraction form
    82,768.70/124,153.05 = 20,439.20/x
  3. Step 3: Cross multiply
    82,768.70x = 124,153.05 × 20,439.20
  4. Step 4: Simplify right side
    82,768.70x = 2,537,589,019.56
  5. Step 5: Solve for x
    x = 2,537,589,019.56/82,768.70
  6. Step 6: Final answer
    x = 30,658.80

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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.