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Finding the Fourth Proportional to 991.70, 1,368.50 and 549.60

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Solution

The fourth proportional to 991.70, 1,368.50 and 549.60 is: 758.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.70 : 1,368.50 = 549.60 : x
  2. Step 2: Convert to fraction form
    991.70/1,368.50 = 549.60/x
  3. Step 3: Cross multiply
    991.70x = 1,368.50 × 549.60
  4. Step 4: Simplify right side
    991.70x = 752,124.85
  5. Step 5: Solve for x
    x = 752,124.85/991.70
  6. Step 6: Final answer
    x = 758.42

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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.