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Finding the Fourth Proportional to 1,290.22, 1,935.14 and 412.82

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Solution

The fourth proportional to 1,290.22, 1,935.14 and 412.82 is: 619.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.22 : 1,935.14 = 412.82 : x
  2. Step 2: Convert to fraction form
    1,290.22/1,935.14 = 412.82/x
  3. Step 3: Cross multiply
    1,290.22x = 1,935.14 × 412.82
  4. Step 4: Simplify right side
    1,290.22x = 798,864.49
  5. Step 5: Solve for x
    x = 798,864.49/1,290.22
  6. Step 6: Final answer
    x = 619.17

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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.