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Finding the Fourth Proportional to 414.98, 621.86 and 312.34

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Solution

The fourth proportional to 414.98, 621.86 and 312.34 is: 468.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    414.98 : 621.86 = 312.34 : x
  2. Step 2: Convert to fraction form
    414.98/621.86 = 312.34/x
  3. Step 3: Cross multiply
    414.98x = 621.86 × 312.34
  4. Step 4: Simplify right side
    414.98x = 194,231.75
  5. Step 5: Solve for x
    x = 194,231.75/414.98
  6. Step 6: Final answer
    x = 468.05

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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.