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Finding the Fourth Proportional to 1,111.56, 1,668.17 and 418.91

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Solution

The fourth proportional to 1,111.56, 1,668.17 and 418.91 is: 628.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.56 : 1,668.17 = 418.91 : x
  2. Step 2: Convert to fraction form
    1,111.56/1,668.17 = 418.91/x
  3. Step 3: Cross multiply
    1,111.56x = 1,668.17 × 418.91
  4. Step 4: Simplify right side
    1,111.56x = 698,802.66
  5. Step 5: Solve for x
    x = 698,802.66/1,111.56
  6. Step 6: Final answer
    x = 628.67

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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.