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Finding the Fourth Proportional to 1,121.13, 1,546.72 and 678.87

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Solution

The fourth proportional to 1,121.13, 1,546.72 and 678.87 is: 936.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.13 : 1,546.72 = 678.87 : x
  2. Step 2: Convert to fraction form
    1,121.13/1,546.72 = 678.87/x
  3. Step 3: Cross multiply
    1,121.13x = 1,546.72 × 678.87
  4. Step 4: Simplify right side
    1,121.13x = 1,050,021.81
  5. Step 5: Solve for x
    x = 1,050,021.81/1,121.13
  6. Step 6: Final answer
    x = 936.57

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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.