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Finding the Fourth Proportional to 777.28, 1,072.67 and 427.98

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Solution

The fourth proportional to 777.28, 1,072.67 and 427.98 is: 590.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.28 : 1,072.67 = 427.98 : x
  2. Step 2: Convert to fraction form
    777.28/1,072.67 = 427.98/x
  3. Step 3: Cross multiply
    777.28x = 1,072.67 × 427.98
  4. Step 4: Simplify right side
    777.28x = 459,081.31
  5. Step 5: Solve for x
    x = 459,081.31/777.28
  6. Step 6: Final answer
    x = 590.63

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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.