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Finding the Fourth Proportional to 825.17, 1,238.25 and 429.89

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Solution

The fourth proportional to 825.17, 1,238.25 and 429.89 is: 645.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    825.17 : 1,238.25 = 429.89 : x
  2. Step 2: Convert to fraction form
    825.17/1,238.25 = 429.89/x
  3. Step 3: Cross multiply
    825.17x = 1,238.25 × 429.89
  4. Step 4: Simplify right side
    825.17x = 532,305.10
  5. Step 5: Solve for x
    x = 532,305.10/825.17
  6. Step 6: Final answer
    x = 645.09

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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.