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Finding the Fourth Proportional to 1,325.97, 1,987.69 and 492.81

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Solution

The fourth proportional to 1,325.97, 1,987.69 and 492.81 is: 738.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.97 : 1,987.69 = 492.81 : x
  2. Step 2: Convert to fraction form
    1,325.97/1,987.69 = 492.81/x
  3. Step 3: Cross multiply
    1,325.97x = 1,987.69 × 492.81
  4. Step 4: Simplify right side
    1,325.97x = 979,556.93
  5. Step 5: Solve for x
    x = 979,556.93/1,325.97
  6. Step 6: Final answer
    x = 738.75

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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.