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Finding the Fourth Proportional to 1,238.02, 1,708.46 and 678.51

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Solution

The fourth proportional to 1,238.02, 1,708.46 and 678.51 is: 936.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.02 : 1,708.46 = 678.51 : x
  2. Step 2: Convert to fraction form
    1,238.02/1,708.46 = 678.51/x
  3. Step 3: Cross multiply
    1,238.02x = 1,708.46 × 678.51
  4. Step 4: Simplify right side
    1,238.02x = 1,159,195.26
  5. Step 5: Solve for x
    x = 1,159,195.26/1,238.02
  6. Step 6: Final answer
    x = 936.33

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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.