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Finding the Fourth Proportional to 817.87, 1,128.47 and 463.71

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Solution

The fourth proportional to 817.87, 1,128.47 and 463.71 is: 639.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.87 : 1,128.47 = 463.71 : x
  2. Step 2: Convert to fraction form
    817.87/1,128.47 = 463.71/x
  3. Step 3: Cross multiply
    817.87x = 1,128.47 × 463.71
  4. Step 4: Simplify right side
    817.87x = 523,286.04
  5. Step 5: Solve for x
    x = 523,286.04/817.87
  6. Step 6: Final answer
    x = 639.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.