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Finding the Fourth Proportional to 655.45, 905.18 and 406.87

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Solution

The fourth proportional to 655.45, 905.18 and 406.87 is: 561.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.45 : 905.18 = 406.87 : x
  2. Step 2: Convert to fraction form
    655.45/905.18 = 406.87/x
  3. Step 3: Cross multiply
    655.45x = 905.18 × 406.87
  4. Step 4: Simplify right side
    655.45x = 368,291.38
  5. Step 5: Solve for x
    x = 368,291.38/655.45
  6. Step 6: Final answer
    x = 561.89

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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.