Home / 1,243.26-1,865.08-421.34

Finding the Fourth Proportional to 1,243.26, 1,865.08 and 421.34

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Solution

The fourth proportional to 1,243.26, 1,865.08 and 421.34 is: 632.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.26 : 1,865.08 = 421.34 : x
  2. Step 2: Convert to fraction form
    1,243.26/1,865.08 = 421.34/x
  3. Step 3: Cross multiply
    1,243.26x = 1,865.08 × 421.34
  4. Step 4: Simplify right side
    1,243.26x = 785,832.81
  5. Step 5: Solve for x
    x = 785,832.81/1,243.26
  6. Step 6: Final answer
    x = 632.07

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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.