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Finding the Fourth Proportional to 986.86, 1,479.30 and 661.48

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Solution

The fourth proportional to 986.86, 1,479.30 and 661.48 is: 991.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.86 : 1,479.30 = 661.48 : x
  2. Step 2: Convert to fraction form
    986.86/1,479.30 = 661.48/x
  3. Step 3: Cross multiply
    986.86x = 1,479.30 × 661.48
  4. Step 4: Simplify right side
    986.86x = 978,527.36
  5. Step 5: Solve for x
    x = 978,527.36/986.86
  6. Step 6: Final answer
    x = 991.56

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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.