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Finding the Fourth Proportional to 667,128.84, 920,631.20 and 361,197.38

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Solution

The fourth proportional to 667,128.84, 920,631.20 and 361,197.38 is: 498,448.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,128.84 : 920,631.20 = 361,197.38 : x
  2. Step 2: Convert to fraction form
    667,128.84/920,631.20 = 361,197.38/x
  3. Step 3: Cross multiply
    667,128.84x = 920,631.20 × 361,197.38
  4. Step 4: Simplify right side
    667,128.84x = 332,529,570,977.11
  5. Step 5: Solve for x
    x = 332,529,570,977.11/667,128.84
  6. Step 6: Final answer
    x = 498,448.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.