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Finding the Fourth Proportional to 1,368.86, 1,889.22 and 845

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Solution

The fourth proportional to 1,368.86, 1,889.22 and 845 is: 1,166.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.86 : 1,889.22 = 845 : x
  2. Step 2: Convert to fraction form
    1,368.86/1,889.22 = 845/x
  3. Step 3: Cross multiply
    1,368.86x = 1,889.22 × 845
  4. Step 4: Simplify right side
    1,368.86x = 1,596,390.90
  5. Step 5: Solve for x
    x = 1,596,390.90/1,368.86
  6. Step 6: Final answer
    x = 1,166.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.