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Finding the Fourth Proportional to 390.29, 538.47 and 265.73

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Solution

The fourth proportional to 390.29, 538.47 and 265.73 is: 366.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.29 : 538.47 = 265.73 : x
  2. Step 2: Convert to fraction form
    390.29/538.47 = 265.73/x
  3. Step 3: Cross multiply
    390.29x = 538.47 × 265.73
  4. Step 4: Simplify right side
    390.29x = 143,084.94
  5. Step 5: Solve for x
    x = 143,084.94/390.29
  6. Step 6: Final answer
    x = 366.62

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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.