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Finding the Fourth Proportional to 2,015.81, 3,023.90 and 783.31

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Solution

The fourth proportional to 2,015.81, 3,023.90 and 783.31 is: 1,175.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,015.81 : 3,023.90 = 783.31 : x
  2. Step 2: Convert to fraction form
    2,015.81/3,023.90 = 783.31/x
  3. Step 3: Cross multiply
    2,015.81x = 3,023.90 × 783.31
  4. Step 4: Simplify right side
    2,015.81x = 2,368,649.64
  5. Step 5: Solve for x
    x = 2,368,649.64/2,015.81
  6. Step 6: Final answer
    x = 1,175.04

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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.