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Finding the Fourth Proportional to 1,905.11, 2,856.95 and 672.19

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Solution

The fourth proportional to 1,905.11, 2,856.95 and 672.19 is: 1,008.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.11 : 2,856.95 = 672.19 : x
  2. Step 2: Convert to fraction form
    1,905.11/2,856.95 = 672.19/x
  3. Step 3: Cross multiply
    1,905.11x = 2,856.95 × 672.19
  4. Step 4: Simplify right side
    1,905.11x = 1,920,413.22
  5. Step 5: Solve for x
    x = 1,920,413.22/1,905.11
  6. Step 6: Final answer
    x = 1,008.03

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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.