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Finding the Fourth Proportional to 1,378.66, 2,068.32 and 404.73

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Solution

The fourth proportional to 1,378.66, 2,068.32 and 404.73 is: 607.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.66 : 2,068.32 = 404.73 : x
  2. Step 2: Convert to fraction form
    1,378.66/2,068.32 = 404.73/x
  3. Step 3: Cross multiply
    1,378.66x = 2,068.32 × 404.73
  4. Step 4: Simplify right side
    1,378.66x = 837,111.15
  5. Step 5: Solve for x
    x = 837,111.15/1,378.66
  6. Step 6: Final answer
    x = 607.19

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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.