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Finding the Fourth Proportional to 786.92, 1,085.81 and 492.48

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Solution

The fourth proportional to 786.92, 1,085.81 and 492.48 is: 679.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.92 : 1,085.81 = 492.48 : x
  2. Step 2: Convert to fraction form
    786.92/1,085.81 = 492.48/x
  3. Step 3: Cross multiply
    786.92x = 1,085.81 × 492.48
  4. Step 4: Simplify right side
    786.92x = 534,737.25
  5. Step 5: Solve for x
    x = 534,737.25/786.92
  6. Step 6: Final answer
    x = 679.54

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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.