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Finding the Fourth Proportional to 358.35, 492.80 and 299.31

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Solution

The fourth proportional to 358.35, 492.80 and 299.31 is: 411.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.35 : 492.80 = 299.31 : x
  2. Step 2: Convert to fraction form
    358.35/492.80 = 299.31/x
  3. Step 3: Cross multiply
    358.35x = 492.80 × 299.31
  4. Step 4: Simplify right side
    358.35x = 147,498.47
  5. Step 5: Solve for x
    x = 147,498.47/358.35
  6. Step 6: Final answer
    x = 411.60

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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.