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Finding the Fourth Proportional to 991.55, 1,368.38 and 549.50

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Solution

The fourth proportional to 991.55, 1,368.38 and 549.50 is: 758.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.55 : 1,368.38 = 549.50 : x
  2. Step 2: Convert to fraction form
    991.55/1,368.38 = 549.50/x
  3. Step 3: Cross multiply
    991.55x = 1,368.38 × 549.50
  4. Step 4: Simplify right side
    991.55x = 751,915.22
  5. Step 5: Solve for x
    x = 751,915.22/991.55
  6. Step 6: Final answer
    x = 758.33

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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.