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Finding the Fourth Proportional to 390.05, 538.34 and 296.65

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Solution

The fourth proportional to 390.05, 538.34 and 296.65 is: 409.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.05 : 538.34 = 296.65 : x
  2. Step 2: Convert to fraction form
    390.05/538.34 = 296.65/x
  3. Step 3: Cross multiply
    390.05x = 538.34 × 296.65
  4. Step 4: Simplify right side
    390.05x = 159,694.39
  5. Step 5: Solve for x
    x = 159,694.39/390.05
  6. Step 6: Final answer
    x = 409.42

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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.