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Finding the Fourth Proportional to 905.34, 1,357.99 and 289.05

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Solution

The fourth proportional to 905.34, 1,357.99 and 289.05 is: 433.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.34 : 1,357.99 = 289.05 : x
  2. Step 2: Convert to fraction form
    905.34/1,357.99 = 289.05/x
  3. Step 3: Cross multiply
    905.34x = 1,357.99 × 289.05
  4. Step 4: Simplify right side
    905.34x = 392,527.01
  5. Step 5: Solve for x
    x = 392,527.01/905.34
  6. Step 6: Final answer
    x = 433.57

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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.