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Finding the Fourth Proportional to 991.36, 1,368 and 712

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Solution

The fourth proportional to 991.36, 1,368 and 712 is: 982.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.36 : 1,368 = 712 : x
  2. Step 2: Convert to fraction form
    991.36/1,368 = 712/x
  3. Step 3: Cross multiply
    991.36x = 1,368 × 712
  4. Step 4: Simplify right side
    991.36x = 974,016
  5. Step 5: Solve for x
    x = 974,016/991.36
  6. Step 6: Final answer
    x = 982.50

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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.