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Finding the Fourth Proportional to 991.76, 1,368.83 and 572.18

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Solution

The fourth proportional to 991.76, 1,368.83 and 572.18 is: 789.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.76 : 1,368.83 = 572.18 : x
  2. Step 2: Convert to fraction form
    991.76/1,368.83 = 572.18/x
  3. Step 3: Cross multiply
    991.76x = 1,368.83 × 572.18
  4. Step 4: Simplify right side
    991.76x = 783,211.74
  5. Step 5: Solve for x
    x = 783,211.74/991.76
  6. Step 6: Final answer
    x = 789.72

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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.