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Finding the Fourth Proportional to 777.07, 1,072.34 and 427.76

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Solution

The fourth proportional to 777.07, 1,072.34 and 427.76 is: 590.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.07 : 1,072.34 = 427.76 : x
  2. Step 2: Convert to fraction form
    777.07/1,072.34 = 427.76/x
  3. Step 3: Cross multiply
    777.07x = 1,072.34 × 427.76
  4. Step 4: Simplify right side
    777.07x = 458,704.16
  5. Step 5: Solve for x
    x = 458,704.16/777.07
  6. Step 6: Final answer
    x = 590.30

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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.