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Finding the Fourth Proportional to 1,380.34, 2,071.19 and 860.22

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Solution

The fourth proportional to 1,380.34, 2,071.19 and 860.22 is: 1,290.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.34 : 2,071.19 = 860.22 : x
  2. Step 2: Convert to fraction form
    1,380.34/2,071.19 = 860.22/x
  3. Step 3: Cross multiply
    1,380.34x = 2,071.19 × 860.22
  4. Step 4: Simplify right side
    1,380.34x = 1,781,676.37
  5. Step 5: Solve for x
    x = 1,781,676.37/1,380.34
  6. Step 6: Final answer
    x = 1,290.75

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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.