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Finding the Fourth Proportional to 776.56, 1,072.06 and 637.04

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Solution

The fourth proportional to 776.56, 1,072.06 and 637.04 is: 879.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.56 : 1,072.06 = 637.04 : x
  2. Step 2: Convert to fraction form
    776.56/1,072.06 = 637.04/x
  3. Step 3: Cross multiply
    776.56x = 1,072.06 × 637.04
  4. Step 4: Simplify right side
    776.56x = 682,945.10
  5. Step 5: Solve for x
    x = 682,945.10/776.56
  6. Step 6: Final answer
    x = 879.45

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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.