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Finding the Fourth Proportional to 988.31, 1,482.49 and 403.59

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Solution

The fourth proportional to 988.31, 1,482.49 and 403.59 is: 605.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.31 : 1,482.49 = 403.59 : x
  2. Step 2: Convert to fraction form
    988.31/1,482.49 = 403.59/x
  3. Step 3: Cross multiply
    988.31x = 1,482.49 × 403.59
  4. Step 4: Simplify right side
    988.31x = 598,318.14
  5. Step 5: Solve for x
    x = 598,318.14/988.31
  6. Step 6: Final answer
    x = 605.40

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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.