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Finding the Fourth Proportional to 746.43, 1,120.29 and 313.89

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Solution

The fourth proportional to 746.43, 1,120.29 and 313.89 is: 471.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    746.43 : 1,120.29 = 313.89 : x
  2. Step 2: Convert to fraction form
    746.43/1,120.29 = 313.89/x
  3. Step 3: Cross multiply
    746.43x = 1,120.29 × 313.89
  4. Step 4: Simplify right side
    746.43x = 351,647.83
  5. Step 5: Solve for x
    x = 351,647.83/746.43
  6. Step 6: Final answer
    x = 471.11

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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.