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Finding the Fourth Proportional to 1,105.93, 1,658.44 and 661.65

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Solution

The fourth proportional to 1,105.93, 1,658.44 and 661.65 is: 992.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.93 : 1,658.44 = 661.65 : x
  2. Step 2: Convert to fraction form
    1,105.93/1,658.44 = 661.65/x
  3. Step 3: Cross multiply
    1,105.93x = 1,658.44 × 661.65
  4. Step 4: Simplify right side
    1,105.93x = 1,097,301.43
  5. Step 5: Solve for x
    x = 1,097,301.43/1,105.93
  6. Step 6: Final answer
    x = 992.20

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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.