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Finding the Fourth Proportional to 988.15, 1,363.89 and 694.12

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Solution

The fourth proportional to 988.15, 1,363.89 and 694.12 is: 958.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.15 : 1,363.89 = 694.12 : x
  2. Step 2: Convert to fraction form
    988.15/1,363.89 = 694.12/x
  3. Step 3: Cross multiply
    988.15x = 1,363.89 × 694.12
  4. Step 4: Simplify right side
    988.15x = 946,703.33
  5. Step 5: Solve for x
    x = 946,703.33/988.15
  6. Step 6: Final answer
    x = 958.06

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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.