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Finding the Fourth Proportional to 991.50, 1,368.26 and 549.42

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Solution

The fourth proportional to 991.50, 1,368.26 and 549.42 is: 758.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.50 : 1,368.26 = 549.42 : x
  2. Step 2: Convert to fraction form
    991.50/1,368.26 = 549.42/x
  3. Step 3: Cross multiply
    991.50x = 1,368.26 × 549.42
  4. Step 4: Simplify right side
    991.50x = 751,749.41
  5. Step 5: Solve for x
    x = 751,749.41/991.50
  6. Step 6: Final answer
    x = 758.19

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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.