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Finding the Fourth Proportional to 777.94, 1,072.32 and 611.90

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Solution

The fourth proportional to 777.94, 1,072.32 and 611.90 is: 843.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.94 : 1,072.32 = 611.90 : x
  2. Step 2: Convert to fraction form
    777.94/1,072.32 = 611.90/x
  3. Step 3: Cross multiply
    777.94x = 1,072.32 × 611.90
  4. Step 4: Simplify right side
    777.94x = 656,152.61
  5. Step 5: Solve for x
    x = 656,152.61/777.94
  6. Step 6: Final answer
    x = 843.45

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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.