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Finding the Fourth Proportional to 988.35, 1,359.90 and 966.48

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Solution

The fourth proportional to 988.35, 1,359.90 and 966.48 is: 1,329.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.35 : 1,359.90 = 966.48 : x
  2. Step 2: Convert to fraction form
    988.35/1,359.90 = 966.48/x
  3. Step 3: Cross multiply
    988.35x = 1,359.90 × 966.48
  4. Step 4: Simplify right side
    988.35x = 1,314,316.15
  5. Step 5: Solve for x
    x = 1,314,316.15/988.35
  6. Step 6: Final answer
    x = 1,329.81

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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.