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Finding the Fourth Proportional to 905.49, 1,357.79 and 320.40

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Solution

The fourth proportional to 905.49, 1,357.79 and 320.40 is: 480.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.49 : 1,357.79 = 320.40 : x
  2. Step 2: Convert to fraction form
    905.49/1,357.79 = 320.40/x
  3. Step 3: Cross multiply
    905.49x = 1,357.79 × 320.40
  4. Step 4: Simplify right side
    905.49x = 435,034.31
  5. Step 5: Solve for x
    x = 435,034.31/905.49
  6. Step 6: Final answer
    x = 480.44

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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.