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Finding the Fourth Proportional to 2,587.46, 3,879.93 and 855.50

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Solution

The fourth proportional to 2,587.46, 3,879.93 and 855.50 is: 1,282.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,587.46 : 3,879.93 = 855.50 : x
  2. Step 2: Convert to fraction form
    2,587.46/3,879.93 = 855.50/x
  3. Step 3: Cross multiply
    2,587.46x = 3,879.93 × 855.50
  4. Step 4: Simplify right side
    2,587.46x = 3,319,280.12
  5. Step 5: Solve for x
    x = 3,319,280.12/2,587.46
  6. Step 6: Final answer
    x = 1,282.83

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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.