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Finding the Fourth Proportional to 1,325.69, 1,988.54 and 351.80

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Solution

The fourth proportional to 1,325.69, 1,988.54 and 351.80 is: 527.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.69 : 1,988.54 = 351.80 : x
  2. Step 2: Convert to fraction form
    1,325.69/1,988.54 = 351.80/x
  3. Step 3: Cross multiply
    1,325.69x = 1,988.54 × 351.80
  4. Step 4: Simplify right side
    1,325.69x = 699,556.67
  5. Step 5: Solve for x
    x = 699,556.67/1,325.69
  6. Step 6: Final answer
    x = 527.69

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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.