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Finding the Fourth Proportional to 786.96, 1,085.44 and 577.20

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Solution

The fourth proportional to 786.96, 1,085.44 and 577.20 is: 796.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.96 : 1,085.44 = 577.20 : x
  2. Step 2: Convert to fraction form
    786.96/1,085.44 = 577.20/x
  3. Step 3: Cross multiply
    786.96x = 1,085.44 × 577.20
  4. Step 4: Simplify right side
    786.96x = 626,515.97
  5. Step 5: Solve for x
    x = 626,515.97/786.96
  6. Step 6: Final answer
    x = 796.12

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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.