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Finding the Fourth Proportional to 1,257.56, 1,886.40 and 380.09

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Solution

The fourth proportional to 1,257.56, 1,886.40 and 380.09 is: 570.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.56 : 1,886.40 = 380.09 : x
  2. Step 2: Convert to fraction form
    1,257.56/1,886.40 = 380.09/x
  3. Step 3: Cross multiply
    1,257.56x = 1,886.40 × 380.09
  4. Step 4: Simplify right side
    1,257.56x = 717,001.78
  5. Step 5: Solve for x
    x = 717,001.78/1,257.56
  6. Step 6: Final answer
    x = 570.15

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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.