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Finding the Fourth Proportional to 988.49, 1,483.31 and 403.40

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Solution

The fourth proportional to 988.49, 1,483.31 and 403.40 is: 605.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.49 : 1,483.31 = 403.40 : x
  2. Step 2: Convert to fraction form
    988.49/1,483.31 = 403.40/x
  3. Step 3: Cross multiply
    988.49x = 1,483.31 × 403.40
  4. Step 4: Simplify right side
    988.49x = 598,371.97
  5. Step 5: Solve for x
    x = 598,371.97/988.49
  6. Step 6: Final answer
    x = 605.34

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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.