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Finding the Fourth Proportional to 2,085.52, 3,128.64 and 787.36

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Solution

The fourth proportional to 2,085.52, 3,128.64 and 787.36 is: 1,181.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.52 : 3,128.64 = 787.36 : x
  2. Step 2: Convert to fraction form
    2,085.52/3,128.64 = 787.36/x
  3. Step 3: Cross multiply
    2,085.52x = 3,128.64 × 787.36
  4. Step 4: Simplify right side
    2,085.52x = 2,463,365.99
  5. Step 5: Solve for x
    x = 2,463,365.99/2,085.52
  6. Step 6: Final answer
    x = 1,181.18

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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.