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Finding the Fourth Proportional to 1,161.99, 1,603.33 and 720

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Solution

The fourth proportional to 1,161.99, 1,603.33 and 720 is: 993.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,161.99 : 1,603.33 = 720 : x
  2. Step 2: Convert to fraction form
    1,161.99/1,603.33 = 720/x
  3. Step 3: Cross multiply
    1,161.99x = 1,603.33 × 720
  4. Step 4: Simplify right side
    1,161.99x = 1,154,395.80
  5. Step 5: Solve for x
    x = 1,154,395.80/1,161.99
  6. Step 6: Final answer
    x = 993.46

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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.