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Finding the Fourth Proportional to 777.07, 1,072.31 and 445.51

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Solution

The fourth proportional to 777.07, 1,072.31 and 445.51 is: 614.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.07 : 1,072.31 = 445.51 : x
  2. Step 2: Convert to fraction form
    777.07/1,072.31 = 445.51/x
  3. Step 3: Cross multiply
    777.07x = 1,072.31 × 445.51
  4. Step 4: Simplify right side
    777.07x = 477,724.83
  5. Step 5: Solve for x
    x = 477,724.83/777.07
  6. Step 6: Final answer
    x = 614.78

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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.