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Finding the Fourth Proportional to 540.72, 745.56 and 391.41

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Solution

The fourth proportional to 540.72, 745.56 and 391.41 is: 539.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.72 : 745.56 = 391.41 : x
  2. Step 2: Convert to fraction form
    540.72/745.56 = 391.41/x
  3. Step 3: Cross multiply
    540.72x = 745.56 × 391.41
  4. Step 4: Simplify right side
    540.72x = 291,819.64
  5. Step 5: Solve for x
    x = 291,819.64/540.72
  6. Step 6: Final answer
    x = 539.69

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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.