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Finding the Fourth Proportional to 1,311.52, 1,965.36 and 661.36

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Solution

The fourth proportional to 1,311.52, 1,965.36 and 661.36 is: 991.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.52 : 1,965.36 = 661.36 : x
  2. Step 2: Convert to fraction form
    1,311.52/1,965.36 = 661.36/x
  3. Step 3: Cross multiply
    1,311.52x = 1,965.36 × 661.36
  4. Step 4: Simplify right side
    1,311.52x = 1,299,810.49
  5. Step 5: Solve for x
    x = 1,299,810.49/1,311.52
  6. Step 6: Final answer
    x = 991.07

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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.