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Finding the Fourth Proportional to 402.35, 603.61 and 128.46

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Solution

The fourth proportional to 402.35, 603.61 and 128.46 is: 192.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.35 : 603.61 = 128.46 : x
  2. Step 2: Convert to fraction form
    402.35/603.61 = 128.46/x
  3. Step 3: Cross multiply
    402.35x = 603.61 × 128.46
  4. Step 4: Simplify right side
    402.35x = 77,539.74
  5. Step 5: Solve for x
    x = 77,539.74/402.35
  6. Step 6: Final answer
    x = 192.72

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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.