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Finding the Fourth Proportional to 2,637.18, 3,954.60 and 787.68

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Solution

The fourth proportional to 2,637.18, 3,954.60 and 787.68 is: 1,181.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,637.18 : 3,954.60 = 787.68 : x
  2. Step 2: Convert to fraction form
    2,637.18/3,954.60 = 787.68/x
  3. Step 3: Cross multiply
    2,637.18x = 3,954.60 × 787.68
  4. Step 4: Simplify right side
    2,637.18x = 3,114,959.33
  5. Step 5: Solve for x
    x = 3,114,959.33/2,637.18
  6. Step 6: Final answer
    x = 1,181.17

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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.