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Finding the Fourth Proportional to 402.15, 603.26 and 128.25

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Solution

The fourth proportional to 402.15, 603.26 and 128.25 is: 192.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.15 : 603.26 = 128.25 : x
  2. Step 2: Convert to fraction form
    402.15/603.26 = 128.25/x
  3. Step 3: Cross multiply
    402.15x = 603.26 × 128.25
  4. Step 4: Simplify right side
    402.15x = 77,368.66
  5. Step 5: Solve for x
    x = 77,368.66/402.15
  6. Step 6: Final answer
    x = 192.39

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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.