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Finding the Fourth Proportional to 2,787.32, 4,181.88 and 939.28

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Solution

The fourth proportional to 2,787.32, 4,181.88 and 939.28 is: 1,409.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,787.32 : 4,181.88 = 939.28 : x
  2. Step 2: Convert to fraction form
    2,787.32/4,181.88 = 939.28/x
  3. Step 3: Cross multiply
    2,787.32x = 4,181.88 × 939.28
  4. Step 4: Simplify right side
    2,787.32x = 3,927,956.25
  5. Step 5: Solve for x
    x = 3,927,956.25/2,787.32
  6. Step 6: Final answer
    x = 1,409.22

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1.5x scale

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.