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Finding the Fourth Proportional to 991.79, 1,368.61 and 549.71

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Solution

The fourth proportional to 991.79, 1,368.61 and 549.71 is: 758.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.79 : 1,368.61 = 549.71 : x
  2. Step 2: Convert to fraction form
    991.79/1,368.61 = 549.71/x
  3. Step 3: Cross multiply
    991.79x = 1,368.61 × 549.71
  4. Step 4: Simplify right side
    991.79x = 752,335.85
  5. Step 5: Solve for x
    x = 752,335.85/991.79
  6. Step 6: Final answer
    x = 758.56

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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.