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Finding the Fourth Proportional to 1,211.32, 1,817.01 and 389.67

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Solution

The fourth proportional to 1,211.32, 1,817.01 and 389.67 is: 584.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.32 : 1,817.01 = 389.67 : x
  2. Step 2: Convert to fraction form
    1,211.32/1,817.01 = 389.67/x
  3. Step 3: Cross multiply
    1,211.32x = 1,817.01 × 389.67
  4. Step 4: Simplify right side
    1,211.32x = 708,034.29
  5. Step 5: Solve for x
    x = 708,034.29/1,211.32
  6. Step 6: Final answer
    x = 584.51

Related Problems

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Double scale
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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.