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Finding the Fourth Proportional to 388.44, 582.12 and 215.19

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Solution

The fourth proportional to 388.44, 582.12 and 215.19 is: 322.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.44 : 582.12 = 215.19 : x
  2. Step 2: Convert to fraction form
    388.44/582.12 = 215.19/x
  3. Step 3: Cross multiply
    388.44x = 582.12 × 215.19
  4. Step 4: Simplify right side
    388.44x = 125,266.40
  5. Step 5: Solve for x
    x = 125,266.40/388.44
  6. Step 6: Final answer
    x = 322.49

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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.