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Finding the Fourth Proportional to 1,120.65, 1,546.34 and 678.60

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Solution

The fourth proportional to 1,120.65, 1,546.34 and 678.60 is: 936.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.65 : 1,546.34 = 678.60 : x
  2. Step 2: Convert to fraction form
    1,120.65/1,546.34 = 678.60/x
  3. Step 3: Cross multiply
    1,120.65x = 1,546.34 × 678.60
  4. Step 4: Simplify right side
    1,120.65x = 1,049,342.93
  5. Step 5: Solve for x
    x = 1,049,342.93/1,120.65
  6. Step 6: Final answer
    x = 936.37

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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.