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Finding the Fourth Proportional to 1,379.78, 2,068.88 and 455.09

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Solution

The fourth proportional to 1,379.78, 2,068.88 and 455.09 is: 682.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.78 : 2,068.88 = 455.09 : x
  2. Step 2: Convert to fraction form
    1,379.78/2,068.88 = 455.09/x
  3. Step 3: Cross multiply
    1,379.78x = 2,068.88 × 455.09
  4. Step 4: Simplify right side
    1,379.78x = 941,533.36
  5. Step 5: Solve for x
    x = 941,533.36/1,379.78
  6. Step 6: Final answer
    x = 682.38

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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.