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Finding the Fourth Proportional to 1,378.94, 2,068.54 and 391.82

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Solution

The fourth proportional to 1,378.94, 2,068.54 and 391.82 is: 587.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.94 : 2,068.54 = 391.82 : x
  2. Step 2: Convert to fraction form
    1,378.94/2,068.54 = 391.82/x
  3. Step 3: Cross multiply
    1,378.94x = 2,068.54 × 391.82
  4. Step 4: Simplify right side
    1,378.94x = 810,484.02
  5. Step 5: Solve for x
    x = 810,484.02/1,378.94
  6. Step 6: Final answer
    x = 587.76

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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.