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Finding the Fourth Proportional to 997.86, 1,377.12 and 649.56

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Solution

The fourth proportional to 997.86, 1,377.12 and 649.56 is: 896.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.86 : 1,377.12 = 649.56 : x
  2. Step 2: Convert to fraction form
    997.86/1,377.12 = 649.56/x
  3. Step 3: Cross multiply
    997.86x = 1,377.12 × 649.56
  4. Step 4: Simplify right side
    997.86x = 894,522.07
  5. Step 5: Solve for x
    x = 894,522.07/997.86
  6. Step 6: Final answer
    x = 896.44

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1.5x scale

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.