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Finding the Fourth Proportional to 1,120.61, 1,546.50 and 678.55

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Solution

The fourth proportional to 1,120.61, 1,546.50 and 678.55 is: 936.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,120.61 : 1,546.50 = 678.55 : x
  2. Step 2: Convert to fraction form
    1,120.61/1,546.50 = 678.55/x
  3. Step 3: Cross multiply
    1,120.61x = 1,546.50 × 678.55
  4. Step 4: Simplify right side
    1,120.61x = 1,049,376.25
  5. Step 5: Solve for x
    x = 1,049,376.25/1,120.61
  6. Step 6: Final answer
    x = 936.44

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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.