Home / 1,395.19-2,092.78-421.26

Finding the Fourth Proportional to 1,395.19, 2,092.78 and 421.26

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Solution

The fourth proportional to 1,395.19, 2,092.78 and 421.26 is: 631.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,395.19 : 2,092.78 = 421.26 : x
  2. Step 2: Convert to fraction form
    1,395.19/2,092.78 = 421.26/x
  3. Step 3: Cross multiply
    1,395.19x = 2,092.78 × 421.26
  4. Step 4: Simplify right side
    1,395.19x = 881,604.50
  5. Step 5: Solve for x
    x = 881,604.50/1,395.19
  6. Step 6: Final answer
    x = 631.89

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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.