Home / 1,211.38-1,816.16-389.18

Finding the Fourth Proportional to 1,211.38, 1,816.16 and 389.18

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Solution

The fourth proportional to 1,211.38, 1,816.16 and 389.18 is: 583.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.38 : 1,816.16 = 389.18 : x
  2. Step 2: Convert to fraction form
    1,211.38/1,816.16 = 389.18/x
  3. Step 3: Cross multiply
    1,211.38x = 1,816.16 × 389.18
  4. Step 4: Simplify right side
    1,211.38x = 706,818.66
  5. Step 5: Solve for x
    x = 706,818.66/1,211.38
  6. Step 6: Final answer
    x = 583.48

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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.