Home / 1,128.54-1,685.20-1,121.70

Finding the Fourth Proportional to 1,128.54, 1,685.20 and 1,121.70

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Solution

The fourth proportional to 1,128.54, 1,685.20 and 1,121.70 is: 1,674.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.54 : 1,685.20 = 1,121.70 : x
  2. Step 2: Convert to fraction form
    1,128.54/1,685.20 = 1,121.70/x
  3. Step 3: Cross multiply
    1,128.54x = 1,685.20 × 1,121.70
  4. Step 4: Simplify right side
    1,128.54x = 1,890,288.84
  5. Step 5: Solve for x
    x = 1,890,288.84/1,128.54
  6. Step 6: Final answer
    x = 1,674.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.