Home / 1,211.08-1,668.80-931.30

Finding the Fourth Proportional to 1,211.08, 1,668.80 and 931.30

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Solution

The fourth proportional to 1,211.08, 1,668.80 and 931.30 is: 1,283.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.08 : 1,668.80 = 931.30 : x
  2. Step 2: Convert to fraction form
    1,211.08/1,668.80 = 931.30/x
  3. Step 3: Cross multiply
    1,211.08x = 1,668.80 × 931.30
  4. Step 4: Simplify right side
    1,211.08x = 1,554,153.44
  5. Step 5: Solve for x
    x = 1,554,153.44/1,211.08
  6. Step 6: Final answer
    x = 1,283.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.