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Finding the Fourth Proportional to 1,074.06, 1,611.90 and 860.22

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Solution

The fourth proportional to 1,074.06, 1,611.90 and 860.22 is: 1,290.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,074.06 : 1,611.90 = 860.22 : x
  2. Step 2: Convert to fraction form
    1,074.06/1,611.90 = 860.22/x
  3. Step 3: Cross multiply
    1,074.06x = 1,611.90 × 860.22
  4. Step 4: Simplify right side
    1,074.06x = 1,386,588.62
  5. Step 5: Solve for x
    x = 1,386,588.62/1,074.06
  6. Step 6: Final answer
    x = 1,290.98

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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.