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Finding the Fourth Proportional to 1,120.64, 1,546.20 and 678.56

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Solution

The fourth proportional to 1,120.64, 1,546.20 and 678.56 is: 936.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.64 : 1,546.20 = 678.56 : x
  2. Step 2: Convert to fraction form
    1,120.64/1,546.20 = 678.56/x
  3. Step 3: Cross multiply
    1,120.64x = 1,546.20 × 678.56
  4. Step 4: Simplify right side
    1,120.64x = 1,049,189.47
  5. Step 5: Solve for x
    x = 1,049,189.47/1,120.64
  6. Step 6: Final answer
    x = 936.24

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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.