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Finding the Fourth Proportional to 998.64, 1,379.25 and 666.50

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Solution

The fourth proportional to 998.64, 1,379.25 and 666.50 is: 920.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.64 : 1,379.25 = 666.50 : x
  2. Step 2: Convert to fraction form
    998.64/1,379.25 = 666.50/x
  3. Step 3: Cross multiply
    998.64x = 1,379.25 × 666.50
  4. Step 4: Simplify right side
    998.64x = 919,263.23
  5. Step 5: Solve for x
    x = 919,263.23/998.64
  6. Step 6: Final answer
    x = 920.52

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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.