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Finding the Fourth Proportional to 540.07, 745.31 and 307.20

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Solution

The fourth proportional to 540.07, 745.31 and 307.20 is: 423.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    540.07 : 745.31 = 307.20 : x
  2. Step 2: Convert to fraction form
    540.07/745.31 = 307.20/x
  3. Step 3: Cross multiply
    540.07x = 745.31 × 307.20
  4. Step 4: Simplify right side
    540.07x = 228,959.23
  5. Step 5: Solve for x
    x = 228,959.23/540.07
  6. Step 6: Final answer
    x = 423.94

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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.