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Finding the Fourth Proportional to 997.61, 1,376.62 and 572.25

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Solution

The fourth proportional to 997.61, 1,376.62 and 572.25 is: 789.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.61 : 1,376.62 = 572.25 : x
  2. Step 2: Convert to fraction form
    997.61/1,376.62 = 572.25/x
  3. Step 3: Cross multiply
    997.61x = 1,376.62 × 572.25
  4. Step 4: Simplify right side
    997.61x = 787,775.67
  5. Step 5: Solve for x
    x = 787,775.67/997.61
  6. Step 6: Final answer
    x = 789.66

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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.