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Finding the Fourth Proportional to 992.21, 1,368.91 and 572.41

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Solution

The fourth proportional to 992.21, 1,368.91 and 572.41 is: 789.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.21 : 1,368.91 = 572.41 : x
  2. Step 2: Convert to fraction form
    992.21/1,368.91 = 572.41/x
  3. Step 3: Cross multiply
    992.21x = 1,368.91 × 572.41
  4. Step 4: Simplify right side
    992.21x = 783,580.20
  5. Step 5: Solve for x
    x = 783,580.20/992.21
  6. Step 6: Final answer
    x = 789.74

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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.