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Finding the Fourth Proportional to 539.10, 743.40 and 381.66

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Solution

The fourth proportional to 539.10, 743.40 and 381.66 is: 526.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    539.10 : 743.40 = 381.66 : x
  2. Step 2: Convert to fraction form
    539.10/743.40 = 381.66/x
  3. Step 3: Cross multiply
    539.10x = 743.40 × 381.66
  4. Step 4: Simplify right side
    539.10x = 283,726.04
  5. Step 5: Solve for x
    x = 283,726.04/539.10
  6. Step 6: Final answer
    x = 526.30

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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.