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Finding the Fourth Proportional to 745.17, 1,116.41 and 311.55

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Solution

The fourth proportional to 745.17, 1,116.41 and 311.55 is: 466.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.17 : 1,116.41 = 311.55 : x
  2. Step 2: Convert to fraction form
    745.17/1,116.41 = 311.55/x
  3. Step 3: Cross multiply
    745.17x = 1,116.41 × 311.55
  4. Step 4: Simplify right side
    745.17x = 347,815.98
  5. Step 5: Solve for x
    x = 347,815.98/745.17
  6. Step 6: Final answer
    x = 466.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.