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Finding the Fourth Proportional to 3,085.56, 4,628.28 and 777

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Solution

The fourth proportional to 3,085.56, 4,628.28 and 777 is: 1,165.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,085.56 : 4,628.28 = 777 : x
  2. Step 2: Convert to fraction form
    3,085.56/4,628.28 = 777/x
  3. Step 3: Cross multiply
    3,085.56x = 4,628.28 × 777
  4. Step 4: Simplify right side
    3,085.56x = 3,596,173.56
  5. Step 5: Solve for x
    x = 3,596,173.56/3,085.56
  6. Step 6: Final answer
    x = 1,165.48

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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.