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Finding the Fourth Proportional to 991.47, 1,368.11 and 549.37

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Solution

The fourth proportional to 991.47, 1,368.11 and 549.37 is: 758.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.47 : 1,368.11 = 549.37 : x
  2. Step 2: Convert to fraction form
    991.47/1,368.11 = 549.37/x
  3. Step 3: Cross multiply
    991.47x = 1,368.11 × 549.37
  4. Step 4: Simplify right side
    991.47x = 751,590.89
  5. Step 5: Solve for x
    x = 751,590.89/991.47
  6. Step 6: Final answer
    x = 758.05

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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.