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Finding the Fourth Proportional to 1,209.47, 1,668.52 and 998.87

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Solution

The fourth proportional to 1,209.47, 1,668.52 and 998.87 is: 1,377.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.47 : 1,668.52 = 998.87 : x
  2. Step 2: Convert to fraction form
    1,209.47/1,668.52 = 998.87/x
  3. Step 3: Cross multiply
    1,209.47x = 1,668.52 × 998.87
  4. Step 4: Simplify right side
    1,209.47x = 1,666,636.25
  5. Step 5: Solve for x
    x = 1,666,636.25/1,209.47
  6. Step 6: Final answer
    x = 1,377.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.