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Finding the Fourth Proportional to 538.11, 741.42 and 390.42

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Solution

The fourth proportional to 538.11, 741.42 and 390.42 is: 537.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.11 : 741.42 = 390.42 : x
  2. Step 2: Convert to fraction form
    538.11/741.42 = 390.42/x
  3. Step 3: Cross multiply
    538.11x = 741.42 × 390.42
  4. Step 4: Simplify right side
    538.11x = 289,465.20
  5. Step 5: Solve for x
    x = 289,465.20/538.11
  6. Step 6: Final answer
    x = 537.93

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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.