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Finding the Fourth Proportional to 930.46, 1,282.81 and 668.02

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Solution

The fourth proportional to 930.46, 1,282.81 and 668.02 is: 920.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.46 : 1,282.81 = 668.02 : x
  2. Step 2: Convert to fraction form
    930.46/1,282.81 = 668.02/x
  3. Step 3: Cross multiply
    930.46x = 1,282.81 × 668.02
  4. Step 4: Simplify right side
    930.46x = 856,942.74
  5. Step 5: Solve for x
    x = 856,942.74/930.46
  6. Step 6: Final answer
    x = 920.99

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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.