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Finding the Fourth Proportional to 388.69, 582.75 and 145.22

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Solution

The fourth proportional to 388.69, 582.75 and 145.22 is: 217.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.69 : 582.75 = 145.22 : x
  2. Step 2: Convert to fraction form
    388.69/582.75 = 145.22/x
  3. Step 3: Cross multiply
    388.69x = 582.75 × 145.22
  4. Step 4: Simplify right side
    388.69x = 84,624.04
  5. Step 5: Solve for x
    x = 84,624.04/388.69
  6. Step 6: Final answer
    x = 217.72

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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.