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Finding the Fourth Proportional to 997.95, 1,377.20 and 555.84

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Solution

The fourth proportional to 997.95, 1,377.20 and 555.84 is: 767.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.95 : 1,377.20 = 555.84 : x
  2. Step 2: Convert to fraction form
    997.95/1,377.20 = 555.84/x
  3. Step 3: Cross multiply
    997.95x = 1,377.20 × 555.84
  4. Step 4: Simplify right side
    997.95x = 765,500.07
  5. Step 5: Solve for x
    x = 765,500.07/997.95
  6. Step 6: Final answer
    x = 767.07

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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.