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Finding the Fourth Proportional to 988.88, 1,480.68 and 641.21

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Solution

The fourth proportional to 988.88, 1,480.68 and 641.21 is: 960.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.88 : 1,480.68 = 641.21 : x
  2. Step 2: Convert to fraction form
    988.88/1,480.68 = 641.21/x
  3. Step 3: Cross multiply
    988.88x = 1,480.68 × 641.21
  4. Step 4: Simplify right side
    988.88x = 949,419.42
  5. Step 5: Solve for x
    x = 949,419.42/988.88
  6. Step 6: Final answer
    x = 960.10

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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.