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Finding the Fourth Proportional to 1,378.63, 1,900.29 and 1,129.51

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Solution

The fourth proportional to 1,378.63, 1,900.29 and 1,129.51 is: 1,556.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.63 : 1,900.29 = 1,129.51 : x
  2. Step 2: Convert to fraction form
    1,378.63/1,900.29 = 1,129.51/x
  3. Step 3: Cross multiply
    1,378.63x = 1,900.29 × 1,129.51
  4. Step 4: Simplify right side
    1,378.63x = 2,146,396.56
  5. Step 5: Solve for x
    x = 2,146,396.56/1,378.63
  6. Step 6: Final answer
    x = 1,556.91

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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.