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Finding the Fourth Proportional to 402.06, 602.88 and 128.04

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Solution

The fourth proportional to 402.06, 602.88 and 128.04 is: 191.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.06 : 602.88 = 128.04 : x
  2. Step 2: Convert to fraction form
    402.06/602.88 = 128.04/x
  3. Step 3: Cross multiply
    402.06x = 602.88 × 128.04
  4. Step 4: Simplify right side
    402.06x = 77,192.76
  5. Step 5: Solve for x
    x = 77,192.76/402.06
  6. Step 6: Final answer
    x = 191.99

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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.