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Finding the Fourth Proportional to 1,288.03, 1,777.47 and 698.56

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Solution

The fourth proportional to 1,288.03, 1,777.47 and 698.56 is: 964.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.03 : 1,777.47 = 698.56 : x
  2. Step 2: Convert to fraction form
    1,288.03/1,777.47 = 698.56/x
  3. Step 3: Cross multiply
    1,288.03x = 1,777.47 × 698.56
  4. Step 4: Simplify right side
    1,288.03x = 1,241,669.44
  5. Step 5: Solve for x
    x = 1,241,669.44/1,288.03
  6. Step 6: Final answer
    x = 964.01

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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.