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Finding the Fourth Proportional to 445,123.20, 667,728 and 129,573.12

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Solution

The fourth proportional to 445,123.20, 667,728 and 129,573.12 is: 194,372.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,123.20 : 667,728 = 129,573.12 : x
  2. Step 2: Convert to fraction form
    445,123.20/667,728 = 129,573.12/x
  3. Step 3: Cross multiply
    445,123.20x = 667,728 × 129,573.12
  4. Step 4: Simplify right side
    445,123.20x = 86,519,600,271.36
  5. Step 5: Solve for x
    x = 86,519,600,271.36/445,123.20
  6. Step 6: Final answer
    x = 194,372.26

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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.