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Finding the Fourth Proportional to 2,585.80, 3,878.70 and 854.60

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Solution

The fourth proportional to 2,585.80, 3,878.70 and 854.60 is: 1,281.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,585.80 : 3,878.70 = 854.60 : x
  2. Step 2: Convert to fraction form
    2,585.80/3,878.70 = 854.60/x
  3. Step 3: Cross multiply
    2,585.80x = 3,878.70 × 854.60
  4. Step 4: Simplify right side
    2,585.80x = 3,314,737.02
  5. Step 5: Solve for x
    x = 3,314,737.02/2,585.80
  6. Step 6: Final answer
    x = 1,281.90

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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.