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Finding the Fourth Proportional to 1,290.03, 1,935.92 and 1,213.21

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Solution

The fourth proportional to 1,290.03, 1,935.92 and 1,213.21 is: 1,820.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.03 : 1,935.92 = 1,213.21 : x
  2. Step 2: Convert to fraction form
    1,290.03/1,935.92 = 1,213.21/x
  3. Step 3: Cross multiply
    1,290.03x = 1,935.92 × 1,213.21
  4. Step 4: Simplify right side
    1,290.03x = 2,348,677.50
  5. Step 5: Solve for x
    x = 2,348,677.50/1,290.03
  6. Step 6: Final answer
    x = 1,820.64

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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.