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Finding the Fourth Proportional to 540.30, 745.50 and 319.21

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Solution

The fourth proportional to 540.30, 745.50 and 319.21 is: 440.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.30 : 745.50 = 319.21 : x
  2. Step 2: Convert to fraction form
    540.30/745.50 = 319.21/x
  3. Step 3: Cross multiply
    540.30x = 745.50 × 319.21
  4. Step 4: Simplify right side
    540.30x = 237,971.06
  5. Step 5: Solve for x
    x = 237,971.06/540.30
  6. Step 6: Final answer
    x = 440.44

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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.