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Finding the Fourth Proportional to 1,379.10, 2,068.86 and 454.49

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Solution

The fourth proportional to 1,379.10, 2,068.86 and 454.49 is: 681.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.10 : 2,068.86 = 454.49 : x
  2. Step 2: Convert to fraction form
    1,379.10/2,068.86 = 454.49/x
  3. Step 3: Cross multiply
    1,379.10x = 2,068.86 × 454.49
  4. Step 4: Simplify right side
    1,379.10x = 940,276.18
  5. Step 5: Solve for x
    x = 940,276.18/1,379.10
  6. Step 6: Final answer
    x = 681.80

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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.