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Finding the Fourth Proportional to 678.52, 1,017.86 and 638.04

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Solution

The fourth proportional to 678.52, 1,017.86 and 638.04 is: 957.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.52 : 1,017.86 = 638.04 : x
  2. Step 2: Convert to fraction form
    678.52/1,017.86 = 638.04/x
  3. Step 3: Cross multiply
    678.52x = 1,017.86 × 638.04
  4. Step 4: Simplify right side
    678.52x = 649,435.39
  5. Step 5: Solve for x
    x = 649,435.39/678.52
  6. Step 6: Final answer
    x = 957.14

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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.