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Finding the Fourth Proportional to 753.48, 1,040.44 and 629.80

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Solution

The fourth proportional to 753.48, 1,040.44 and 629.80 is: 869.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.48 : 1,040.44 = 629.80 : x
  2. Step 2: Convert to fraction form
    753.48/1,040.44 = 629.80/x
  3. Step 3: Cross multiply
    753.48x = 1,040.44 × 629.80
  4. Step 4: Simplify right side
    753.48x = 655,269.11
  5. Step 5: Solve for x
    x = 655,269.11/753.48
  6. Step 6: Final answer
    x = 869.66

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.