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Finding the Fourth Proportional to 905.65, 1,358.64 and 357.82

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Solution

The fourth proportional to 905.65, 1,358.64 and 357.82 is: 536.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.65 : 1,358.64 = 357.82 : x
  2. Step 2: Convert to fraction form
    905.65/1,358.64 = 357.82/x
  3. Step 3: Cross multiply
    905.65x = 1,358.64 × 357.82
  4. Step 4: Simplify right side
    905.65x = 486,148.56
  5. Step 5: Solve for x
    x = 486,148.56/905.65
  6. Step 6: Final answer
    x = 536.80

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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.