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Finding the Fourth Proportional to 1,238.51, 1,709.14 and 678.96

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Solution

The fourth proportional to 1,238.51, 1,709.14 and 678.96 is: 936.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.51 : 1,709.14 = 678.96 : x
  2. Step 2: Convert to fraction form
    1,238.51/1,709.14 = 678.96/x
  3. Step 3: Cross multiply
    1,238.51x = 1,709.14 × 678.96
  4. Step 4: Simplify right side
    1,238.51x = 1,160,437.69
  5. Step 5: Solve for x
    x = 1,160,437.69/1,238.51
  6. Step 6: Final answer
    x = 936.96

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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.