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Finding the Fourth Proportional to 401.92, 602.87 and 128.03

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Solution

The fourth proportional to 401.92, 602.87 and 128.03 is: 192.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.92 : 602.87 = 128.03 : x
  2. Step 2: Convert to fraction form
    401.92/602.87 = 128.03/x
  3. Step 3: Cross multiply
    401.92x = 602.87 × 128.03
  4. Step 4: Simplify right side
    401.92x = 77,181.79
  5. Step 5: Solve for x
    x = 77,181.79/401.92
  6. Step 6: Final answer
    x = 192.04

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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.