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Finding the Fourth Proportional to 1,254, 1,879.76 and 842.19

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Solution

The fourth proportional to 1,254, 1,879.76 and 842.19 is: 1,262.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,254 : 1,879.76 = 842.19 : x
  2. Step 2: Convert to fraction form
    1,254/1,879.76 = 842.19/x
  3. Step 3: Cross multiply
    1,254x = 1,879.76 × 842.19
  4. Step 4: Simplify right side
    1,254x = 1,583,110.86
  5. Step 5: Solve for x
    x = 1,583,110.86/1,254
  6. Step 6: Final answer
    x = 1,262.45

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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.