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Finding the Fourth Proportional to 427.01, 640.78 and 153.16

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Solution

The fourth proportional to 427.01, 640.78 and 153.16 is: 229.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.01 : 640.78 = 153.16 : x
  2. Step 2: Convert to fraction form
    427.01/640.78 = 153.16/x
  3. Step 3: Cross multiply
    427.01x = 640.78 × 153.16
  4. Step 4: Simplify right side
    427.01x = 98,139.88
  5. Step 5: Solve for x
    x = 98,139.88/427.01
  6. Step 6: Final answer
    x = 229.83

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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.