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Finding the Fourth Proportional to 427.80, 641.91 and 154.10

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Solution

The fourth proportional to 427.80, 641.91 and 154.10 is: 231.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.80 : 641.91 = 154.10 : x
  2. Step 2: Convert to fraction form
    427.80/641.91 = 154.10/x
  3. Step 3: Cross multiply
    427.80x = 641.91 × 154.10
  4. Step 4: Simplify right side
    427.80x = 98,915.12
  5. Step 5: Solve for x
    x = 98,915.12/427.80
  6. Step 6: Final answer
    x = 231.22

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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.