Home / 1,243.68-1,865.26-421.93

Finding the Fourth Proportional to 1,243.68, 1,865.26 and 421.93

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Solution

The fourth proportional to 1,243.68, 1,865.26 and 421.93 is: 632.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.68 : 1,865.26 = 421.93 : x
  2. Step 2: Convert to fraction form
    1,243.68/1,865.26 = 421.93/x
  3. Step 3: Cross multiply
    1,243.68x = 1,865.26 × 421.93
  4. Step 4: Simplify right side
    1,243.68x = 787,009.15
  5. Step 5: Solve for x
    x = 787,009.15/1,243.68
  6. Step 6: Final answer
    x = 632.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.