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Finding the Fourth Proportional to 3,085.78, 4,628.70 and 777.28

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Solution

The fourth proportional to 3,085.78, 4,628.70 and 777.28 is: 1,165.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,085.78 : 4,628.70 = 777.28 : x
  2. Step 2: Convert to fraction form
    3,085.78/4,628.70 = 777.28/x
  3. Step 3: Cross multiply
    3,085.78x = 4,628.70 × 777.28
  4. Step 4: Simplify right side
    3,085.78x = 3,597,795.94
  5. Step 5: Solve for x
    x = 3,597,795.94/3,085.78
  6. Step 6: Final answer
    x = 1,165.93

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1.5x scale

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.