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Finding the Fourth Proportional to 445.67, 666.93 and 390.68

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Solution

The fourth proportional to 445.67, 666.93 and 390.68 is: 584.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.67 : 666.93 = 390.68 : x
  2. Step 2: Convert to fraction form
    445.67/666.93 = 390.68/x
  3. Step 3: Cross multiply
    445.67x = 666.93 × 390.68
  4. Step 4: Simplify right side
    445.67x = 260,556.21
  5. Step 5: Solve for x
    x = 260,556.21/445.67
  6. Step 6: Final answer
    x = 584.64

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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.