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Finding the Fourth Proportional to 998.24, 1,377.20 and 666.56

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Solution

The fourth proportional to 998.24, 1,377.20 and 666.56 is: 919.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.24 : 1,377.20 = 666.56 : x
  2. Step 2: Convert to fraction form
    998.24/1,377.20 = 666.56/x
  3. Step 3: Cross multiply
    998.24x = 1,377.20 × 666.56
  4. Step 4: Simplify right side
    998.24x = 917,986.43
  5. Step 5: Solve for x
    x = 917,986.43/998.24
  6. Step 6: Final answer
    x = 919.60

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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.