Home / 1,392.22-2,087.98-405.03

Finding the Fourth Proportional to 1,392.22, 2,087.98 and 405.03

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Solution

The fourth proportional to 1,392.22, 2,087.98 and 405.03 is: 607.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.22 : 2,087.98 = 405.03 : x
  2. Step 2: Convert to fraction form
    1,392.22/2,087.98 = 405.03/x
  3. Step 3: Cross multiply
    1,392.22x = 2,087.98 × 405.03
  4. Step 4: Simplify right side
    1,392.22x = 845,701.36
  5. Step 5: Solve for x
    x = 845,701.36/1,392.22
  6. Step 6: Final answer
    x = 607.45

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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.