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Finding the Fourth Proportional to 1,257.20, 1,886.26 and 608

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Solution

The fourth proportional to 1,257.20, 1,886.26 and 608 is: 912.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.20 : 1,886.26 = 608 : x
  2. Step 2: Convert to fraction form
    1,257.20/1,886.26 = 608/x
  3. Step 3: Cross multiply
    1,257.20x = 1,886.26 × 608
  4. Step 4: Simplify right side
    1,257.20x = 1,146,846.08
  5. Step 5: Solve for x
    x = 1,146,846.08/1,257.20
  6. Step 6: Final answer
    x = 912.22

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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.