Home / 1,211.05-1,817.33-389.93

Finding the Fourth Proportional to 1,211.05, 1,817.33 and 389.93

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Solution

The fourth proportional to 1,211.05, 1,817.33 and 389.93 is: 585.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.05 : 1,817.33 = 389.93 : x
  2. Step 2: Convert to fraction form
    1,211.05/1,817.33 = 389.93/x
  3. Step 3: Cross multiply
    1,211.05x = 1,817.33 × 389.93
  4. Step 4: Simplify right side
    1,211.05x = 708,631.49
  5. Step 5: Solve for x
    x = 708,631.49/1,211.05
  6. Step 6: Final answer
    x = 585.14

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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.