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Finding the Fourth Proportional to 1,428.79, 2,142.78 and 551.23

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Solution

The fourth proportional to 1,428.79, 2,142.78 and 551.23 is: 826.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.79 : 2,142.78 = 551.23 : x
  2. Step 2: Convert to fraction form
    1,428.79/2,142.78 = 551.23/x
  3. Step 3: Cross multiply
    1,428.79x = 2,142.78 × 551.23
  4. Step 4: Simplify right side
    1,428.79x = 1,181,164.62
  5. Step 5: Solve for x
    x = 1,181,164.62/1,428.79
  6. Step 6: Final answer
    x = 826.69

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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.