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Finding the Fourth Proportional to 988.39, 1,364.61 and 694.36

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Solution

The fourth proportional to 988.39, 1,364.61 and 694.36 is: 958.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.39 : 1,364.61 = 694.36 : x
  2. Step 2: Convert to fraction form
    988.39/1,364.61 = 694.36/x
  3. Step 3: Cross multiply
    988.39x = 1,364.61 × 694.36
  4. Step 4: Simplify right side
    988.39x = 947,530.60
  5. Step 5: Solve for x
    x = 947,530.60/988.39
  6. Step 6: Final answer
    x = 958.66

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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.