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Finding the Fourth Proportional to 1,376.12, 1,898.96 and 786.64

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Solution

The fourth proportional to 1,376.12, 1,898.96 and 786.64 is: 1,085.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.12 : 1,898.96 = 786.64 : x
  2. Step 2: Convert to fraction form
    1,376.12/1,898.96 = 786.64/x
  3. Step 3: Cross multiply
    1,376.12x = 1,898.96 × 786.64
  4. Step 4: Simplify right side
    1,376.12x = 1,493,797.89
  5. Step 5: Solve for x
    x = 1,493,797.89/1,376.12
  6. Step 6: Final answer
    x = 1,085.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.