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Finding the Fourth Proportional to 390.54, 585.81 and 299.46

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Solution

The fourth proportional to 390.54, 585.81 and 299.46 is: 449.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.54 : 585.81 = 299.46 : x
  2. Step 2: Convert to fraction form
    390.54/585.81 = 299.46/x
  3. Step 3: Cross multiply
    390.54x = 585.81 × 299.46
  4. Step 4: Simplify right side
    390.54x = 175,426.66
  5. Step 5: Solve for x
    x = 175,426.66/390.54
  6. Step 6: Final answer
    x = 449.19

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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.