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Finding the Fourth Proportional to 1,211.08, 1,815.74 and 918.28

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Solution

The fourth proportional to 1,211.08, 1,815.74 and 918.28 is: 1,376.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.08 : 1,815.74 = 918.28 : x
  2. Step 2: Convert to fraction form
    1,211.08/1,815.74 = 918.28/x
  3. Step 3: Cross multiply
    1,211.08x = 1,815.74 × 918.28
  4. Step 4: Simplify right side
    1,211.08x = 1,667,357.73
  5. Step 5: Solve for x
    x = 1,667,357.73/1,211.08
  6. Step 6: Final answer
    x = 1,376.75

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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.