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Finding the Fourth Proportional to 777.12, 1,165.44 and 726

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Solution

The fourth proportional to 777.12, 1,165.44 and 726 is: 1,088.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.12 : 1,165.44 = 726 : x
  2. Step 2: Convert to fraction form
    777.12/1,165.44 = 726/x
  3. Step 3: Cross multiply
    777.12x = 1,165.44 × 726
  4. Step 4: Simplify right side
    777.12x = 846,109.44
  5. Step 5: Solve for x
    x = 846,109.44/777.12
  6. Step 6: Final answer
    x = 1,088.78

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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.