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Finding the Fourth Proportional to 991.97, 1,368.98 and 572.40

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Solution

The fourth proportional to 991.97, 1,368.98 and 572.40 is: 789.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.97 : 1,368.98 = 572.40 : x
  2. Step 2: Convert to fraction form
    991.97/1,368.98 = 572.40/x
  3. Step 3: Cross multiply
    991.97x = 1,368.98 × 572.40
  4. Step 4: Simplify right side
    991.97x = 783,605.58
  5. Step 5: Solve for x
    x = 783,605.58/991.97
  6. Step 6: Final answer
    x = 789.95

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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.