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Finding the Fourth Proportional to 2,657.60, 3,986.40 and 1,787.20

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Solution

The fourth proportional to 2,657.60, 3,986.40 and 1,787.20 is: 2,680.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,657.60 : 3,986.40 = 1,787.20 : x
  2. Step 2: Convert to fraction form
    2,657.60/3,986.40 = 1,787.20/x
  3. Step 3: Cross multiply
    2,657.60x = 3,986.40 × 1,787.20
  4. Step 4: Simplify right side
    2,657.60x = 7,124,494.08
  5. Step 5: Solve for x
    x = 7,124,494.08/2,657.60
  6. Step 6: Final answer
    x = 2,680.80

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Similar ratio
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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.