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Finding the Fourth Proportional to 551.56, 826.58 and 429.26

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Solution

The fourth proportional to 551.56, 826.58 and 429.26 is: 643.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.56 : 826.58 = 429.26 : x
  2. Step 2: Convert to fraction form
    551.56/826.58 = 429.26/x
  3. Step 3: Cross multiply
    551.56x = 826.58 × 429.26
  4. Step 4: Simplify right side
    551.56x = 354,817.73
  5. Step 5: Solve for x
    x = 354,817.73/551.56
  6. Step 6: Final answer
    x = 643.30

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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.