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Finding the Fourth Proportional to 988.84, 1,481.34 and 476.20

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Solution

The fourth proportional to 988.84, 1,481.34 and 476.20 is: 713.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.84 : 1,481.34 = 476.20 : x
  2. Step 2: Convert to fraction form
    988.84/1,481.34 = 476.20/x
  3. Step 3: Cross multiply
    988.84x = 1,481.34 × 476.20
  4. Step 4: Simplify right side
    988.84x = 705,414.11
  5. Step 5: Solve for x
    x = 705,414.11/988.84
  6. Step 6: Final answer
    x = 713.38

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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.