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Finding the Fourth Proportional to 678.52, 1,013.36 and 641.26

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Solution

The fourth proportional to 678.52, 1,013.36 and 641.26 is: 957.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.52 : 1,013.36 = 641.26 : x
  2. Step 2: Convert to fraction form
    678.52/1,013.36 = 641.26/x
  3. Step 3: Cross multiply
    678.52x = 1,013.36 × 641.26
  4. Step 4: Simplify right side
    678.52x = 649,827.23
  5. Step 5: Solve for x
    x = 649,827.23/678.52
  6. Step 6: Final answer
    x = 957.71

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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.