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Finding the Fourth Proportional to 988.10, 1,481.09 and 554.34

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Solution

The fourth proportional to 988.10, 1,481.09 and 554.34 is: 830.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.10 : 1,481.09 = 554.34 : x
  2. Step 2: Convert to fraction form
    988.10/1,481.09 = 554.34/x
  3. Step 3: Cross multiply
    988.10x = 1,481.09 × 554.34
  4. Step 4: Simplify right side
    988.10x = 821,030.21
  5. Step 5: Solve for x
    x = 821,030.21/988.10
  6. Step 6: Final answer
    x = 830.92

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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.