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Finding the Fourth Proportional to 786.06, 1,085.49 and 506.78

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Solution

The fourth proportional to 786.06, 1,085.49 and 506.78 is: 699.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.06 : 1,085.49 = 506.78 : x
  2. Step 2: Convert to fraction form
    786.06/1,085.49 = 506.78/x
  3. Step 3: Cross multiply
    786.06x = 1,085.49 × 506.78
  4. Step 4: Simplify right side
    786.06x = 550,099.19
  5. Step 5: Solve for x
    x = 550,099.19/786.06
  6. Step 6: Final answer
    x = 699.82

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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.