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Finding the Fourth Proportional to 1,992.45, 2,988.66 and 531.72

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Solution

The fourth proportional to 1,992.45, 2,988.66 and 531.72 is: 797.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.45 : 2,988.66 = 531.72 : x
  2. Step 2: Convert to fraction form
    1,992.45/2,988.66 = 531.72/x
  3. Step 3: Cross multiply
    1,992.45x = 2,988.66 × 531.72
  4. Step 4: Simplify right side
    1,992.45x = 1,589,130.30
  5. Step 5: Solve for x
    x = 1,589,130.30/1,992.45
  6. Step 6: Final answer
    x = 797.58

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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.