Home / 1,223.22-1,685.19-1,000.87

Finding the Fourth Proportional to 1,223.22, 1,685.19 and 1,000.87

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Solution

The fourth proportional to 1,223.22, 1,685.19 and 1,000.87 is: 1,378.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.22 : 1,685.19 = 1,000.87 : x
  2. Step 2: Convert to fraction form
    1,223.22/1,685.19 = 1,000.87/x
  3. Step 3: Cross multiply
    1,223.22x = 1,685.19 × 1,000.87
  4. Step 4: Simplify right side
    1,223.22x = 1,686,651.11
  5. Step 5: Solve for x
    x = 1,686,651.11/1,223.22
  6. Step 6: Final answer
    x = 1,378.87

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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.