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Finding the Fourth Proportional to 2,761.44, 4,142.29 and 912.51

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Solution

The fourth proportional to 2,761.44, 4,142.29 and 912.51 is: 1,368.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,761.44 : 4,142.29 = 912.51 : x
  2. Step 2: Convert to fraction form
    2,761.44/4,142.29 = 912.51/x
  3. Step 3: Cross multiply
    2,761.44x = 4,142.29 × 912.51
  4. Step 4: Simplify right side
    2,761.44x = 3,779,866.13
  5. Step 5: Solve for x
    x = 3,779,866.13/2,761.44
  6. Step 6: Final answer
    x = 1,368.81

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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.