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Finding the Fourth Proportional to 1,431.36, 1,971.36 and 1,209.60

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Solution

The fourth proportional to 1,431.36, 1,971.36 and 1,209.60 is: 1,665.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.36 : 1,971.36 = 1,209.60 : x
  2. Step 2: Convert to fraction form
    1,431.36/1,971.36 = 1,209.60/x
  3. Step 3: Cross multiply
    1,431.36x = 1,971.36 × 1,209.60
  4. Step 4: Simplify right side
    1,431.36x = 2,384,557.06
  5. Step 5: Solve for x
    x = 2,384,557.06/1,431.36
  6. Step 6: Final answer
    x = 1,665.94

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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.