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Finding the Fourth Proportional to 1,342.29, 2,012.85 and 551.11

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Solution

The fourth proportional to 1,342.29, 2,012.85 and 551.11 is: 826.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,342.29 : 2,012.85 = 551.11 : x
  2. Step 2: Convert to fraction form
    1,342.29/2,012.85 = 551.11/x
  3. Step 3: Cross multiply
    1,342.29x = 2,012.85 × 551.11
  4. Step 4: Simplify right side
    1,342.29x = 1,109,300.39
  5. Step 5: Solve for x
    x = 1,109,300.39/1,342.29
  6. Step 6: Final answer
    x = 826.42

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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.