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Finding the Fourth Proportional to 1,379.61, 2,069.82 and 455.40

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Solution

The fourth proportional to 1,379.61, 2,069.82 and 455.40 is: 683.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.61 : 2,069.82 = 455.40 : x
  2. Step 2: Convert to fraction form
    1,379.61/2,069.82 = 455.40/x
  3. Step 3: Cross multiply
    1,379.61x = 2,069.82 × 455.40
  4. Step 4: Simplify right side
    1,379.61x = 942,596.03
  5. Step 5: Solve for x
    x = 942,596.03/1,379.61
  6. Step 6: Final answer
    x = 683.23

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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.