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Finding the Fourth Proportional to 540.18, 745.45 and 307.31

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Solution

The fourth proportional to 540.18, 745.45 and 307.31 is: 424.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.18 : 745.45 = 307.31 : x
  2. Step 2: Convert to fraction form
    540.18/745.45 = 307.31/x
  3. Step 3: Cross multiply
    540.18x = 745.45 × 307.31
  4. Step 4: Simplify right side
    540.18x = 229,078.98
  5. Step 5: Solve for x
    x = 229,078.98/540.18
  6. Step 6: Final answer
    x = 424.08

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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.