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Finding the Fourth Proportional to 905.19, 1,357.38 and 288.78

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Solution

The fourth proportional to 905.19, 1,357.38 and 288.78 is: 433.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.19 : 1,357.38 = 288.78 : x
  2. Step 2: Convert to fraction form
    905.19/1,357.38 = 288.78/x
  3. Step 3: Cross multiply
    905.19x = 1,357.38 × 288.78
  4. Step 4: Simplify right side
    905.19x = 391,984.20
  5. Step 5: Solve for x
    x = 391,984.20/905.19
  6. Step 6: Final answer
    x = 433.04

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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.