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Finding the Fourth Proportional to 1,209.26, 1,812.68 and 660.31

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Solution

The fourth proportional to 1,209.26, 1,812.68 and 660.31 is: 989.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.26 : 1,812.68 = 660.31 : x
  2. Step 2: Convert to fraction form
    1,209.26/1,812.68 = 660.31/x
  3. Step 3: Cross multiply
    1,209.26x = 1,812.68 × 660.31
  4. Step 4: Simplify right side
    1,209.26x = 1,196,925.37
  5. Step 5: Solve for x
    x = 1,196,925.37/1,209.26
  6. Step 6: Final answer
    x = 989.80

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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.