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Finding the Fourth Proportional to 576.15, 862.72 and 421.94

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Solution

The fourth proportional to 576.15, 862.72 and 421.94 is: 631.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.15 : 862.72 = 421.94 : x
  2. Step 2: Convert to fraction form
    576.15/862.72 = 421.94/x
  3. Step 3: Cross multiply
    576.15x = 862.72 × 421.94
  4. Step 4: Simplify right side
    576.15x = 364,017.18
  5. Step 5: Solve for x
    x = 364,017.18/576.15
  6. Step 6: Final answer
    x = 631.81

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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.