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Finding the Fourth Proportional to 991.89, 1,368.81 and 572.24

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Solution

The fourth proportional to 991.89, 1,368.81 and 572.24 is: 789.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.89 : 1,368.81 = 572.24 : x
  2. Step 2: Convert to fraction form
    991.89/1,368.81 = 572.24/x
  3. Step 3: Cross multiply
    991.89x = 1,368.81 × 572.24
  4. Step 4: Simplify right side
    991.89x = 783,287.83
  5. Step 5: Solve for x
    x = 783,287.83/991.89
  6. Step 6: Final answer
    x = 789.69

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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.