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Finding the Fourth Proportional to 997.20, 1,376.07 and 555.05

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Solution

The fourth proportional to 997.20, 1,376.07 and 555.05 is: 765.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.20 : 1,376.07 = 555.05 : x
  2. Step 2: Convert to fraction form
    997.20/1,376.07 = 555.05/x
  3. Step 3: Cross multiply
    997.20x = 1,376.07 × 555.05
  4. Step 4: Simplify right side
    997.20x = 763,780.77
  5. Step 5: Solve for x
    x = 763,780.77/997.20
  6. Step 6: Final answer
    x = 765.93

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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.