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Finding the Fourth Proportional to 988.39, 1,363.98 and 615.37

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Solution

The fourth proportional to 988.39, 1,363.98 and 615.37 is: 849.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.39 : 1,363.98 = 615.37 : x
  2. Step 2: Convert to fraction form
    988.39/1,363.98 = 615.37/x
  3. Step 3: Cross multiply
    988.39x = 1,363.98 × 615.37
  4. Step 4: Simplify right side
    988.39x = 839,352.37
  5. Step 5: Solve for x
    x = 839,352.37/988.39
  6. Step 6: Final answer
    x = 849.21

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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.