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Finding the Fourth Proportional to 988.63, 1,480.31 and 640.96

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Solution

The fourth proportional to 988.63, 1,480.31 and 640.96 is: 959.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.63 : 1,480.31 = 640.96 : x
  2. Step 2: Convert to fraction form
    988.63/1,480.31 = 640.96/x
  3. Step 3: Cross multiply
    988.63x = 1,480.31 × 640.96
  4. Step 4: Simplify right side
    988.63x = 948,808.89
  5. Step 5: Solve for x
    x = 948,808.89/988.63
  6. Step 6: Final answer
    x = 959.73

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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.