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Finding the Fourth Proportional to 991.85, 1,368.76 and 572.20

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Solution

The fourth proportional to 991.85, 1,368.76 and 572.20 is: 789.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.85 : 1,368.76 = 572.20 : x
  2. Step 2: Convert to fraction form
    991.85/1,368.76 = 572.20/x
  3. Step 3: Cross multiply
    991.85x = 1,368.76 × 572.20
  4. Step 4: Simplify right side
    991.85x = 783,202.19
  5. Step 5: Solve for x
    x = 783,202.19/991.85
  6. Step 6: Final answer
    x = 789.63

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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.