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Finding the Fourth Proportional to 986.68, 1,479.02 and 640.24

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Solution

The fourth proportional to 986.68, 1,479.02 and 640.24 is: 959.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.68 : 1,479.02 = 640.24 : x
  2. Step 2: Convert to fraction form
    986.68/1,479.02 = 640.24/x
  3. Step 3: Cross multiply
    986.68x = 1,479.02 × 640.24
  4. Step 4: Simplify right side
    986.68x = 946,925.67
  5. Step 5: Solve for x
    x = 946,925.67/986.68
  6. Step 6: Final answer
    x = 959.71

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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.