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Finding the Fourth Proportional to 655.92, 905.15 and 357.15

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Solution

The fourth proportional to 655.92, 905.15 and 357.15 is: 492.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.92 : 905.15 = 357.15 : x
  2. Step 2: Convert to fraction form
    655.92/905.15 = 357.15/x
  3. Step 3: Cross multiply
    655.92x = 905.15 × 357.15
  4. Step 4: Simplify right side
    655.92x = 323,274.32
  5. Step 5: Solve for x
    x = 323,274.32/655.92
  6. Step 6: Final answer
    x = 492.86

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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.