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Finding the Fourth Proportional to 991.60, 1,368.26 and 571.89

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Solution

The fourth proportional to 991.60, 1,368.26 and 571.89 is: 789.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.60 : 1,368.26 = 571.89 : x
  2. Step 2: Convert to fraction form
    991.60/1,368.26 = 571.89/x
  3. Step 3: Cross multiply
    991.60x = 1,368.26 × 571.89
  4. Step 4: Simplify right side
    991.60x = 782,494.21
  5. Step 5: Solve for x
    x = 782,494.21/991.60
  6. Step 6: Final answer
    x = 789.13

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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.