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Finding the Fourth Proportional to 753.48, 1,129.77 and 445.38

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Solution

The fourth proportional to 753.48, 1,129.77 and 445.38 is: 667.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.48 : 1,129.77 = 445.38 : x
  2. Step 2: Convert to fraction form
    753.48/1,129.77 = 445.38/x
  3. Step 3: Cross multiply
    753.48x = 1,129.77 × 445.38
  4. Step 4: Simplify right side
    753.48x = 503,176.96
  5. Step 5: Solve for x
    x = 503,176.96/753.48
  6. Step 6: Final answer
    x = 667.80

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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.