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Finding the Fourth Proportional to 388.55, 582.75 and 128.52

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Solution

The fourth proportional to 388.55, 582.75 and 128.52 is: 192.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.55 : 582.75 = 128.52 : x
  2. Step 2: Convert to fraction form
    388.55/582.75 = 128.52/x
  3. Step 3: Cross multiply
    388.55x = 582.75 × 128.52
  4. Step 4: Simplify right side
    388.55x = 74,895.03
  5. Step 5: Solve for x
    x = 74,895.03/388.55
  6. Step 6: Final answer
    x = 192.76

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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.