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Finding the Fourth Proportional to 988.40, 1,363.56 and 615.44

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Solution

The fourth proportional to 988.40, 1,363.56 and 615.44 is: 849.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.40 : 1,363.56 = 615.44 : x
  2. Step 2: Convert to fraction form
    988.40/1,363.56 = 615.44/x
  3. Step 3: Cross multiply
    988.40x = 1,363.56 × 615.44
  4. Step 4: Simplify right side
    988.40x = 839,189.37
  5. Step 5: Solve for x
    x = 839,189.37/988.40
  6. Step 6: Final answer
    x = 849.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.