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Finding the Fourth Proportional to 1,090.99, 1,632.93 and 720.91

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Solution

The fourth proportional to 1,090.99, 1,632.93 and 720.91 is: 1,079.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,090.99 : 1,632.93 = 720.91 : x
  2. Step 2: Convert to fraction form
    1,090.99/1,632.93 = 720.91/x
  3. Step 3: Cross multiply
    1,090.99x = 1,632.93 × 720.91
  4. Step 4: Simplify right side
    1,090.99x = 1,177,195.57
  5. Step 5: Solve for x
    x = 1,177,195.57/1,090.99
  6. Step 6: Final answer
    x = 1,079.02

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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.