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Finding the Fourth Proportional to 1,287.94, 1,777.36 and 698.48

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Solution

The fourth proportional to 1,287.94, 1,777.36 and 698.48 is: 963.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.94 : 1,777.36 = 698.48 : x
  2. Step 2: Convert to fraction form
    1,287.94/1,777.36 = 698.48/x
  3. Step 3: Cross multiply
    1,287.94x = 1,777.36 × 698.48
  4. Step 4: Simplify right side
    1,287.94x = 1,241,450.41
  5. Step 5: Solve for x
    x = 1,241,450.41/1,287.94
  6. Step 6: Final answer
    x = 963.90

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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.