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Finding the Fourth Proportional to 402.10, 603.18 and 128.18

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Solution

The fourth proportional to 402.10, 603.18 and 128.18 is: 192.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.10 : 603.18 = 128.18 : x
  2. Step 2: Convert to fraction form
    402.10/603.18 = 128.18/x
  3. Step 3: Cross multiply
    402.10x = 603.18 × 128.18
  4. Step 4: Simplify right side
    402.10x = 77,317.12
  5. Step 5: Solve for x
    x = 77,317.12/402.10
  6. Step 6: Final answer
    x = 192.28

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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.