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Finding the Fourth Proportional to 997.17, 1,374.85 and 642.51

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Solution

The fourth proportional to 997.17, 1,374.85 and 642.51 is: 885.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.17 : 1,374.85 = 642.51 : x
  2. Step 2: Convert to fraction form
    997.17/1,374.85 = 642.51/x
  3. Step 3: Cross multiply
    997.17x = 1,374.85 × 642.51
  4. Step 4: Simplify right side
    997.17x = 883,350.00
  5. Step 5: Solve for x
    x = 883,350.00/997.17
  6. Step 6: Final answer
    x = 885.85

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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.