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Finding the Fourth Proportional to 986.51, 1,479.74 and 663.93

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Solution

The fourth proportional to 986.51, 1,479.74 and 663.93 is: 995.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.51 : 1,479.74 = 663.93 : x
  2. Step 2: Convert to fraction form
    986.51/1,479.74 = 663.93/x
  3. Step 3: Cross multiply
    986.51x = 1,479.74 × 663.93
  4. Step 4: Simplify right side
    986.51x = 982,440.46
  5. Step 5: Solve for x
    x = 982,440.46/986.51
  6. Step 6: Final answer
    x = 995.87

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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.