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Finding the Fourth Proportional to 2,585.56, 3,878 and 830.74

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Solution

The fourth proportional to 2,585.56, 3,878 and 830.74 is: 1,246.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,585.56 : 3,878 = 830.74 : x
  2. Step 2: Convert to fraction form
    2,585.56/3,878 = 830.74/x
  3. Step 3: Cross multiply
    2,585.56x = 3,878 × 830.74
  4. Step 4: Simplify right side
    2,585.56x = 3,221,609.72
  5. Step 5: Solve for x
    x = 3,221,609.72/2,585.56
  6. Step 6: Final answer
    x = 1,246.00

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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.