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Finding the Fourth Proportional to 1,185.02, 1,635.52 and 687.58

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Solution

The fourth proportional to 1,185.02, 1,635.52 and 687.58 is: 948.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.02 : 1,635.52 = 687.58 : x
  2. Step 2: Convert to fraction form
    1,185.02/1,635.52 = 687.58/x
  3. Step 3: Cross multiply
    1,185.02x = 1,635.52 × 687.58
  4. Step 4: Simplify right side
    1,185.02x = 1,124,550.84
  5. Step 5: Solve for x
    x = 1,124,550.84/1,185.02
  6. Step 6: Final answer
    x = 948.97

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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.