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Finding the Fourth Proportional to 1,109.67, 1,655.91 and 992.85

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Solution

The fourth proportional to 1,109.67, 1,655.91 and 992.85 is: 1,481.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.67 : 1,655.91 = 992.85 : x
  2. Step 2: Convert to fraction form
    1,109.67/1,655.91 = 992.85/x
  3. Step 3: Cross multiply
    1,109.67x = 1,655.91 × 992.85
  4. Step 4: Simplify right side
    1,109.67x = 1,644,070.24
  5. Step 5: Solve for x
    x = 1,644,070.24/1,109.67
  6. Step 6: Final answer
    x = 1,481.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.