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Finding the Fourth Proportional to 1,311.39, 1,809.41 and 787.32

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Solution

The fourth proportional to 1,311.39, 1,809.41 and 787.32 is: 1,086.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.39 : 1,809.41 = 787.32 : x
  2. Step 2: Convert to fraction form
    1,311.39/1,809.41 = 787.32/x
  3. Step 3: Cross multiply
    1,311.39x = 1,809.41 × 787.32
  4. Step 4: Simplify right side
    1,311.39x = 1,424,580.74
  5. Step 5: Solve for x
    x = 1,424,580.74/1,311.39
  6. Step 6: Final answer
    x = 1,086.31

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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.