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Finding the Fourth Proportional to 551.43, 825.53 and 429.32

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Solution

The fourth proportional to 551.43, 825.53 and 429.32 is: 642.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.43 : 825.53 = 429.32 : x
  2. Step 2: Convert to fraction form
    551.43/825.53 = 429.32/x
  3. Step 3: Cross multiply
    551.43x = 825.53 × 429.32
  4. Step 4: Simplify right side
    551.43x = 354,416.54
  5. Step 5: Solve for x
    x = 354,416.54/551.43
  6. Step 6: Final answer
    x = 642.72

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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.