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Finding the Fourth Proportional to 344.80, 517.12 and 128.32

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Solution

The fourth proportional to 344.80, 517.12 and 128.32 is: 192.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    344.80 : 517.12 = 128.32 : x
  2. Step 2: Convert to fraction form
    344.80/517.12 = 128.32/x
  3. Step 3: Cross multiply
    344.80x = 517.12 × 128.32
  4. Step 4: Simplify right side
    344.80x = 66,356.84
  5. Step 5: Solve for x
    x = 66,356.84/344.80
  6. Step 6: Final answer
    x = 192.45

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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.