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Finding the Fourth Proportional to 461.28, 691.40 and 214.64

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Solution

The fourth proportional to 461.28, 691.40 and 214.64 is: 321.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    461.28 : 691.40 = 214.64 : x
  2. Step 2: Convert to fraction form
    461.28/691.40 = 214.64/x
  3. Step 3: Cross multiply
    461.28x = 691.40 × 214.64
  4. Step 4: Simplify right side
    461.28x = 148,402.10
  5. Step 5: Solve for x
    x = 148,402.10/461.28
  6. Step 6: Final answer
    x = 321.72

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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.