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Finding the Fourth Proportional to 1,085.91, 1,628.91 and 316.41

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Solution

The fourth proportional to 1,085.91, 1,628.91 and 316.41 is: 474.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.91 : 1,628.91 = 316.41 : x
  2. Step 2: Convert to fraction form
    1,085.91/1,628.91 = 316.41/x
  3. Step 3: Cross multiply
    1,085.91x = 1,628.91 × 316.41
  4. Step 4: Simplify right side
    1,085.91x = 515,397.30
  5. Step 5: Solve for x
    x = 515,397.30/1,085.91
  6. Step 6: Final answer
    x = 474.62

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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.