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Finding the Fourth Proportional to 862.26, 1,291.50 and 428.64

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Solution

The fourth proportional to 862.26, 1,291.50 and 428.64 is: 642.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.26 : 1,291.50 = 428.64 : x
  2. Step 2: Convert to fraction form
    862.26/1,291.50 = 428.64/x
  3. Step 3: Cross multiply
    862.26x = 1,291.50 × 428.64
  4. Step 4: Simplify right side
    862.26x = 553,588.56
  5. Step 5: Solve for x
    x = 553,588.56/862.26
  6. Step 6: Final answer
    x = 642.02

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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.