Home / 1,211.14-1,816.95-389.39

Finding the Fourth Proportional to 1,211.14, 1,816.95 and 389.39

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Solution

The fourth proportional to 1,211.14, 1,816.95 and 389.39 is: 584.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.14 : 1,816.95 = 389.39 : x
  2. Step 2: Convert to fraction form
    1,211.14/1,816.95 = 389.39/x
  3. Step 3: Cross multiply
    1,211.14x = 1,816.95 × 389.39
  4. Step 4: Simplify right side
    1,211.14x = 707,502.16
  5. Step 5: Solve for x
    x = 707,502.16/1,211.14
  6. Step 6: Final answer
    x = 584.16

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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.