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Finding the Fourth Proportional to 1,185.02, 1,635.22 and 687.68

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Solution

The fourth proportional to 1,185.02, 1,635.22 and 687.68 is: 948.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.02 : 1,635.22 = 687.68 : x
  2. Step 2: Convert to fraction form
    1,185.02/1,635.22 = 687.68/x
  3. Step 3: Cross multiply
    1,185.02x = 1,635.22 × 687.68
  4. Step 4: Simplify right side
    1,185.02x = 1,124,508.09
  5. Step 5: Solve for x
    x = 1,124,508.09/1,185.02
  6. Step 6: Final answer
    x = 948.94

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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.