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Finding the Fourth Proportional to 695, 1,040.78 and 539.64

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Solution

The fourth proportional to 695, 1,040.78 and 539.64 is: 808.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    695 : 1,040.78 = 539.64 : x
  2. Step 2: Convert to fraction form
    695/1,040.78 = 539.64/x
  3. Step 3: Cross multiply
    695x = 1,040.78 × 539.64
  4. Step 4: Simplify right side
    695x = 561,646.52
  5. Step 5: Solve for x
    x = 561,646.52/695
  6. Step 6: Final answer
    x = 808.12

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.