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Finding the Fourth Proportional to 954.99, 1,318.54 and 640.73

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Solution

The fourth proportional to 954.99, 1,318.54 and 640.73 is: 884.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    954.99 : 1,318.54 = 640.73 : x
  2. Step 2: Convert to fraction form
    954.99/1,318.54 = 640.73/x
  3. Step 3: Cross multiply
    954.99x = 1,318.54 × 640.73
  4. Step 4: Simplify right side
    954.99x = 844,819.94
  5. Step 5: Solve for x
    x = 844,819.94/954.99
  6. Step 6: Final answer
    x = 884.64

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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.