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Finding the Fourth Proportional to 1,238.42, 1,709.06 and 678.92

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Solution

The fourth proportional to 1,238.42, 1,709.06 and 678.92 is: 936.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.42 : 1,709.06 = 678.92 : x
  2. Step 2: Convert to fraction form
    1,238.42/1,709.06 = 678.92/x
  3. Step 3: Cross multiply
    1,238.42x = 1,709.06 × 678.92
  4. Step 4: Simplify right side
    1,238.42x = 1,160,303.08
  5. Step 5: Solve for x
    x = 1,160,303.08/1,238.42
  6. Step 6: Final answer
    x = 936.92

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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.