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Finding the Fourth Proportional to 997.72, 1,376.94 and 647.80

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Solution

The fourth proportional to 997.72, 1,376.94 and 647.80 is: 894.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.72 : 1,376.94 = 647.80 : x
  2. Step 2: Convert to fraction form
    997.72/1,376.94 = 647.80/x
  3. Step 3: Cross multiply
    997.72x = 1,376.94 × 647.80
  4. Step 4: Simplify right side
    997.72x = 891,981.73
  5. Step 5: Solve for x
    x = 891,981.73/997.72
  6. Step 6: Final answer
    x = 894.02

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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.