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Finding the Fourth Proportional to 2,636.90, 3,955.53 and 787.86

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Solution

The fourth proportional to 2,636.90, 3,955.53 and 787.86 is: 1,181.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,636.90 : 3,955.53 = 787.86 : x
  2. Step 2: Convert to fraction form
    2,636.90/3,955.53 = 787.86/x
  3. Step 3: Cross multiply
    2,636.90x = 3,955.53 × 787.86
  4. Step 4: Simplify right side
    2,636.90x = 3,116,403.87
  5. Step 5: Solve for x
    x = 3,116,403.87/2,636.90
  6. Step 6: Final answer
    x = 1,181.85

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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.