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Finding the Fourth Proportional to 1,012.12, 1,519.20 and 859.60

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Solution

The fourth proportional to 1,012.12, 1,519.20 and 859.60 is: 1,290.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.12 : 1,519.20 = 859.60 : x
  2. Step 2: Convert to fraction form
    1,012.12/1,519.20 = 859.60/x
  3. Step 3: Cross multiply
    1,012.12x = 1,519.20 × 859.60
  4. Step 4: Simplify right side
    1,012.12x = 1,305,904.32
  5. Step 5: Solve for x
    x = 1,305,904.32/1,012.12
  6. Step 6: Final answer
    x = 1,290.27

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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.