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Finding the Fourth Proportional to 756.99, 1,045.72 and 720.54

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Solution

The fourth proportional to 756.99, 1,045.72 and 720.54 is: 995.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.99 : 1,045.72 = 720.54 : x
  2. Step 2: Convert to fraction form
    756.99/1,045.72 = 720.54/x
  3. Step 3: Cross multiply
    756.99x = 1,045.72 × 720.54
  4. Step 4: Simplify right side
    756.99x = 753,474.26
  5. Step 5: Solve for x
    x = 753,474.26/756.99
  6. Step 6: Final answer
    x = 995.36

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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.