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Finding the Fourth Proportional to 401.96, 603 and 128.06

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Solution

The fourth proportional to 401.96, 603 and 128.06 is: 192.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.96 : 603 = 128.06 : x
  2. Step 2: Convert to fraction form
    401.96/603 = 128.06/x
  3. Step 3: Cross multiply
    401.96x = 603 × 128.06
  4. Step 4: Simplify right side
    401.96x = 77,220.18
  5. Step 5: Solve for x
    x = 77,220.18/401.96
  6. Step 6: Final answer
    x = 192.11

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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.