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Finding the Fourth Proportional to 991.63, 1,368.25 and 571.85

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Solution

The fourth proportional to 991.63, 1,368.25 and 571.85 is: 789.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.63 : 1,368.25 = 571.85 : x
  2. Step 2: Convert to fraction form
    991.63/1,368.25 = 571.85/x
  3. Step 3: Cross multiply
    991.63x = 1,368.25 × 571.85
  4. Step 4: Simplify right side
    991.63x = 782,433.76
  5. Step 5: Solve for x
    x = 782,433.76/991.63
  6. Step 6: Final answer
    x = 789.04

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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.