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Finding the Fourth Proportional to 390.19, 538.19 and 265.66

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Solution

The fourth proportional to 390.19, 538.19 and 265.66 is: 366.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.19 : 538.19 = 265.66 : x
  2. Step 2: Convert to fraction form
    390.19/538.19 = 265.66/x
  3. Step 3: Cross multiply
    390.19x = 538.19 × 265.66
  4. Step 4: Simplify right side
    390.19x = 142,974.23
  5. Step 5: Solve for x
    x = 142,974.23/390.19
  6. Step 6: Final answer
    x = 366.42

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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.