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Finding the Fourth Proportional to 432.12, 647.88 and 212.72

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Solution

The fourth proportional to 432.12, 647.88 and 212.72 is: 318.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.12 : 647.88 = 212.72 : x
  2. Step 2: Convert to fraction form
    432.12/647.88 = 212.72/x
  3. Step 3: Cross multiply
    432.12x = 647.88 × 212.72
  4. Step 4: Simplify right side
    432.12x = 137,817.03
  5. Step 5: Solve for x
    x = 137,817.03/432.12
  6. Step 6: Final answer
    x = 318.93

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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.