Home / 1,419.32-2,128.94-432.13

Finding the Fourth Proportional to 1,419.32, 2,128.94 and 432.13

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Solution

The fourth proportional to 1,419.32, 2,128.94 and 432.13 is: 648.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.32 : 2,128.94 = 432.13 : x
  2. Step 2: Convert to fraction form
    1,419.32/2,128.94 = 432.13/x
  3. Step 3: Cross multiply
    1,419.32x = 2,128.94 × 432.13
  4. Step 4: Simplify right side
    1,419.32x = 919,974.60
  5. Step 5: Solve for x
    x = 919,974.60/1,419.32
  6. Step 6: Final answer
    x = 648.18

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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.