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Finding the Fourth Proportional to 1,331, 1,992.58 and 919.26

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Solution

The fourth proportional to 1,331, 1,992.58 and 919.26 is: 1,376.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331 : 1,992.58 = 919.26 : x
  2. Step 2: Convert to fraction form
    1,331/1,992.58 = 919.26/x
  3. Step 3: Cross multiply
    1,331x = 1,992.58 × 919.26
  4. Step 4: Simplify right side
    1,331x = 1,831,699.09
  5. Step 5: Solve for x
    x = 1,831,699.09/1,331
  6. Step 6: Final answer
    x = 1,376.18

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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.