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Finding the Fourth Proportional to 1,212.06, 1,815.60 and 847.56

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Solution

The fourth proportional to 1,212.06, 1,815.60 and 847.56 is: 1,269.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.06 : 1,815.60 = 847.56 : x
  2. Step 2: Convert to fraction form
    1,212.06/1,815.60 = 847.56/x
  3. Step 3: Cross multiply
    1,212.06x = 1,815.60 × 847.56
  4. Step 4: Simplify right side
    1,212.06x = 1,538,829.94
  5. Step 5: Solve for x
    x = 1,538,829.94/1,212.06
  6. Step 6: Final answer
    x = 1,269.60

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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.