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Finding the Fourth Proportional to 1,288.44, 1,777.10 and 816.41

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Solution

The fourth proportional to 1,288.44, 1,777.10 and 816.41 is: 1,126.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.44 : 1,777.10 = 816.41 : x
  2. Step 2: Convert to fraction form
    1,288.44/1,777.10 = 816.41/x
  3. Step 3: Cross multiply
    1,288.44x = 1,777.10 × 816.41
  4. Step 4: Simplify right side
    1,288.44x = 1,450,842.21
  5. Step 5: Solve for x
    x = 1,450,842.21/1,288.44
  6. Step 6: Final answer
    x = 1,126.05

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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.