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Finding the Fourth Proportional to 666.08, 998.69 and 319.23

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Solution

The fourth proportional to 666.08, 998.69 and 319.23 is: 478.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.08 : 998.69 = 319.23 : x
  2. Step 2: Convert to fraction form
    666.08/998.69 = 319.23/x
  3. Step 3: Cross multiply
    666.08x = 998.69 × 319.23
  4. Step 4: Simplify right side
    666.08x = 318,811.81
  5. Step 5: Solve for x
    x = 318,811.81/666.08
  6. Step 6: Final answer
    x = 478.64

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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.