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Finding the Fourth Proportional to 666.88, 998.94 and 520.47

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Solution

The fourth proportional to 666.88, 998.94 and 520.47 is: 779.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.88 : 998.94 = 520.47 : x
  2. Step 2: Convert to fraction form
    666.88/998.94 = 520.47/x
  3. Step 3: Cross multiply
    666.88x = 998.94 × 520.47
  4. Step 4: Simplify right side
    666.88x = 519,918.30
  5. Step 5: Solve for x
    x = 519,918.30/666.88
  6. Step 6: Final answer
    x = 779.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.