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Finding the Fourth Proportional to 427.35, 640.86 and 153.35

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Solution

The fourth proportional to 427.35, 640.86 and 153.35 is: 229.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.35 : 640.86 = 153.35 : x
  2. Step 2: Convert to fraction form
    427.35/640.86 = 153.35/x
  3. Step 3: Cross multiply
    427.35x = 640.86 × 153.35
  4. Step 4: Simplify right side
    427.35x = 98,275.88
  5. Step 5: Solve for x
    x = 98,275.88/427.35
  6. Step 6: Final answer
    x = 229.97

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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.