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Finding the Fourth Proportional to 684.63, 1,022.78 and 548.01

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Solution

The fourth proportional to 684.63, 1,022.78 and 548.01 is: 818.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.63 : 1,022.78 = 548.01 : x
  2. Step 2: Convert to fraction form
    684.63/1,022.78 = 548.01/x
  3. Step 3: Cross multiply
    684.63x = 1,022.78 × 548.01
  4. Step 4: Simplify right side
    684.63x = 560,495.04
  5. Step 5: Solve for x
    x = 560,495.04/684.63
  6. Step 6: Final answer
    x = 818.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.