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Finding the Fourth Proportional to 905.15, 1,357.88 and 288.69

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Solution

The fourth proportional to 905.15, 1,357.88 and 288.69 is: 433.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.15 : 1,357.88 = 288.69 : x
  2. Step 2: Convert to fraction form
    905.15/1,357.88 = 288.69/x
  3. Step 3: Cross multiply
    905.15x = 1,357.88 × 288.69
  4. Step 4: Simplify right side
    905.15x = 392,004.93
  5. Step 5: Solve for x
    x = 392,004.93/905.15
  6. Step 6: Final answer
    x = 433.09

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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.