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Finding the Fourth Proportional to 1,185.25, 1,635.65 and 661.32

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Solution

The fourth proportional to 1,185.25, 1,635.65 and 661.32 is: 912.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.25 : 1,635.65 = 661.32 : x
  2. Step 2: Convert to fraction form
    1,185.25/1,635.65 = 661.32/x
  3. Step 3: Cross multiply
    1,185.25x = 1,635.65 × 661.32
  4. Step 4: Simplify right side
    1,185.25x = 1,081,688.06
  5. Step 5: Solve for x
    x = 1,081,688.06/1,185.25
  6. Step 6: Final answer
    x = 912.62

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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.