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Finding the Fourth Proportional to 1,267.92, 1,900.92 and 618

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Solution

The fourth proportional to 1,267.92, 1,900.92 and 618 is: 926.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,267.92 : 1,900.92 = 618 : x
  2. Step 2: Convert to fraction form
    1,267.92/1,900.92 = 618/x
  3. Step 3: Cross multiply
    1,267.92x = 1,900.92 × 618
  4. Step 4: Simplify right side
    1,267.92x = 1,174,768.56
  5. Step 5: Solve for x
    x = 1,174,768.56/1,267.92
  6. Step 6: Final answer
    x = 926.53

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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.