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Finding the Fourth Proportional to 991.31, 1,367.15 and 713.37

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Solution

The fourth proportional to 991.31, 1,367.15 and 713.37 is: 983.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.31 : 1,367.15 = 713.37 : x
  2. Step 2: Convert to fraction form
    991.31/1,367.15 = 713.37/x
  3. Step 3: Cross multiply
    991.31x = 1,367.15 × 713.37
  4. Step 4: Simplify right side
    991.31x = 975,280.23
  5. Step 5: Solve for x
    x = 975,280.23/991.31
  6. Step 6: Final answer
    x = 983.83

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1.5x scale

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.