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Finding the Fourth Proportional to 786.56, 1,085.30 and 506.73

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Solution

The fourth proportional to 786.56, 1,085.30 and 506.73 is: 699.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.56 : 1,085.30 = 506.73 : x
  2. Step 2: Convert to fraction form
    786.56/1,085.30 = 506.73/x
  3. Step 3: Cross multiply
    786.56x = 1,085.30 × 506.73
  4. Step 4: Simplify right side
    786.56x = 549,951.54
  5. Step 5: Solve for x
    x = 549,951.54/786.56
  6. Step 6: Final answer
    x = 699.19

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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.