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Finding the Fourth Proportional to 1,120.50, 1,546.17 and 678.47

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Solution

The fourth proportional to 1,120.50, 1,546.17 and 678.47 is: 936.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.50 : 1,546.17 = 678.47 : x
  2. Step 2: Convert to fraction form
    1,120.50/1,546.17 = 678.47/x
  3. Step 3: Cross multiply
    1,120.50x = 1,546.17 × 678.47
  4. Step 4: Simplify right side
    1,120.50x = 1,049,029.96
  5. Step 5: Solve for x
    x = 1,049,029.96/1,120.50
  6. Step 6: Final answer
    x = 936.22

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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.