Home / 1,419.06-2,128.59-431.88

Finding the Fourth Proportional to 1,419.06, 2,128.59 and 431.88

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Solution

The fourth proportional to 1,419.06, 2,128.59 and 431.88 is: 647.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.06 : 2,128.59 = 431.88 : x
  2. Step 2: Convert to fraction form
    1,419.06/2,128.59 = 431.88/x
  3. Step 3: Cross multiply
    1,419.06x = 2,128.59 × 431.88
  4. Step 4: Simplify right side
    1,419.06x = 919,295.45
  5. Step 5: Solve for x
    x = 919,295.45/1,419.06
  6. Step 6: Final answer
    x = 647.82

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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.