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Finding the Fourth Proportional to 1,282.90, 1,920.68 and 849.18

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Solution

The fourth proportional to 1,282.90, 1,920.68 and 849.18 is: 1,271.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.90 : 1,920.68 = 849.18 : x
  2. Step 2: Convert to fraction form
    1,282.90/1,920.68 = 849.18/x
  3. Step 3: Cross multiply
    1,282.90x = 1,920.68 × 849.18
  4. Step 4: Simplify right side
    1,282.90x = 1,631,003.04
  5. Step 5: Solve for x
    x = 1,631,003.04/1,282.90
  6. Step 6: Final answer
    x = 1,271.34

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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.