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Finding the Fourth Proportional to 753.13, 1,129.85 and 445.23

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Solution

The fourth proportional to 753.13, 1,129.85 and 445.23 is: 667.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.13 : 1,129.85 = 445.23 : x
  2. Step 2: Convert to fraction form
    753.13/1,129.85 = 445.23/x
  3. Step 3: Cross multiply
    753.13x = 1,129.85 × 445.23
  4. Step 4: Simplify right side
    753.13x = 503,042.56
  5. Step 5: Solve for x
    x = 503,042.56/753.13
  6. Step 6: Final answer
    x = 667.93

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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.