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Finding the Fourth Proportional to 905.62, 1,358.63 and 515.81

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Solution

The fourth proportional to 905.62, 1,358.63 and 515.81 is: 773.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.62 : 1,358.63 = 515.81 : x
  2. Step 2: Convert to fraction form
    905.62/1,358.63 = 515.81/x
  3. Step 3: Cross multiply
    905.62x = 1,358.63 × 515.81
  4. Step 4: Simplify right side
    905.62x = 700,792.83
  5. Step 5: Solve for x
    x = 700,792.83/905.62
  6. Step 6: Final answer
    x = 773.82

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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.