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Finding the Fourth Proportional to 1,131.98, 1,696.94 and 391.18

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Solution

The fourth proportional to 1,131.98, 1,696.94 and 391.18 is: 586.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.98 : 1,696.94 = 391.18 : x
  2. Step 2: Convert to fraction form
    1,131.98/1,696.94 = 391.18/x
  3. Step 3: Cross multiply
    1,131.98x = 1,696.94 × 391.18
  4. Step 4: Simplify right side
    1,131.98x = 663,808.99
  5. Step 5: Solve for x
    x = 663,808.99/1,131.98
  6. Step 6: Final answer
    x = 586.41

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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.