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Finding the Fourth Proportional to 744.81, 1,029.20 and 720.78

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Solution

The fourth proportional to 744.81, 1,029.20 and 720.78 is: 995.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.81 : 1,029.20 = 720.78 : x
  2. Step 2: Convert to fraction form
    744.81/1,029.20 = 720.78/x
  3. Step 3: Cross multiply
    744.81x = 1,029.20 × 720.78
  4. Step 4: Simplify right side
    744.81x = 741,823.17
  5. Step 5: Solve for x
    x = 741,823.17/744.81
  6. Step 6: Final answer
    x = 995.99

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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.