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Finding the Fourth Proportional to 745.10, 1,116.78 and 311.76

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Solution

The fourth proportional to 745.10, 1,116.78 and 311.76 is: 467.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.10 : 1,116.78 = 311.76 : x
  2. Step 2: Convert to fraction form
    745.10/1,116.78 = 311.76/x
  3. Step 3: Cross multiply
    745.10x = 1,116.78 × 311.76
  4. Step 4: Simplify right side
    745.10x = 348,167.33
  5. Step 5: Solve for x
    x = 348,167.33/745.10
  6. Step 6: Final answer
    x = 467.28

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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.