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Finding the Fourth Proportional to 1,203.81, 1,661.21 and 706.51

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Solution

The fourth proportional to 1,203.81, 1,661.21 and 706.51 is: 974.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.81 : 1,661.21 = 706.51 : x
  2. Step 2: Convert to fraction form
    1,203.81/1,661.21 = 706.51/x
  3. Step 3: Cross multiply
    1,203.81x = 1,661.21 × 706.51
  4. Step 4: Simplify right side
    1,203.81x = 1,173,653.33
  5. Step 5: Solve for x
    x = 1,173,653.33/1,203.81
  6. Step 6: Final answer
    x = 974.95

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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.