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Finding the Fourth Proportional to 862.08, 1,291.84 and 428.48

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Solution

The fourth proportional to 862.08, 1,291.84 and 428.48 is: 642.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    862.08 : 1,291.84 = 428.48 : x
  2. Step 2: Convert to fraction form
    862.08/1,291.84 = 428.48/x
  3. Step 3: Cross multiply
    862.08x = 1,291.84 × 428.48
  4. Step 4: Simplify right side
    862.08x = 553,527.60
  5. Step 5: Solve for x
    x = 553,527.60/862.08
  6. Step 6: Final answer
    x = 642.08

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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.