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Finding the Fourth Proportional to 358.12, 493.86 and 311.32

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Solution

The fourth proportional to 358.12, 493.86 and 311.32 is: 429.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.12 : 493.86 = 311.32 : x
  2. Step 2: Convert to fraction form
    358.12/493.86 = 311.32/x
  3. Step 3: Cross multiply
    358.12x = 493.86 × 311.32
  4. Step 4: Simplify right side
    358.12x = 153,748.50
  5. Step 5: Solve for x
    x = 153,748.50/358.12
  6. Step 6: Final answer
    x = 429.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.