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Finding the Fourth Proportional to 411.56, 615.90 and 313.64

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Solution

The fourth proportional to 411.56, 615.90 and 313.64 is: 469.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.56 : 615.90 = 313.64 : x
  2. Step 2: Convert to fraction form
    411.56/615.90 = 313.64/x
  3. Step 3: Cross multiply
    411.56x = 615.90 × 313.64
  4. Step 4: Simplify right side
    411.56x = 193,170.88
  5. Step 5: Solve for x
    x = 193,170.88/411.56
  6. Step 6: Final answer
    x = 469.36

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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.