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Finding the Fourth Proportional to 776.20, 1,071.48 and 496.45

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Solution

The fourth proportional to 776.20, 1,071.48 and 496.45 is: 685.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.20 : 1,071.48 = 496.45 : x
  2. Step 2: Convert to fraction form
    776.20/1,071.48 = 496.45/x
  3. Step 3: Cross multiply
    776.20x = 1,071.48 × 496.45
  4. Step 4: Simplify right side
    776.20x = 531,936.25
  5. Step 5: Solve for x
    x = 531,936.25/776.20
  6. Step 6: Final answer
    x = 685.31

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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.