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Finding the Fourth Proportional to 1,311.28, 1,967.04 and 661.60

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Solution

The fourth proportional to 1,311.28, 1,967.04 and 661.60 is: 992.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.28 : 1,967.04 = 661.60 : x
  2. Step 2: Convert to fraction form
    1,311.28/1,967.04 = 661.60/x
  3. Step 3: Cross multiply
    1,311.28x = 1,967.04 × 661.60
  4. Step 4: Simplify right side
    1,311.28x = 1,301,393.66
  5. Step 5: Solve for x
    x = 1,301,393.66/1,311.28
  6. Step 6: Final answer
    x = 992.46

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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.