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Finding the Fourth Proportional to 905.81, 1,357.29 and 515.32

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Solution

The fourth proportional to 905.81, 1,357.29 and 515.32 is: 772.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.81 : 1,357.29 = 515.32 : x
  2. Step 2: Convert to fraction form
    905.81/1,357.29 = 515.32/x
  3. Step 3: Cross multiply
    905.81x = 1,357.29 × 515.32
  4. Step 4: Simplify right side
    905.81x = 699,435.29
  5. Step 5: Solve for x
    x = 699,435.29/905.81
  6. Step 6: Final answer
    x = 772.17

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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.